计算机辅助工程技术在摩托车领域中的应用

本文论述了计算机辅助工程技术在摩托车设计及制造中的重要意义及其在我国摩托车领域中的应用状况。同时分析了ＣＡＤ／ＣＡＥ／ＣＡＰＰ／ＣＡＭ／ＰＤＭ／ＣＩＭＳ技术在今后的发展趋势。     

先进的CAE技术以及在我厂产品中的应用

先进的ＣＡＥ技术以及在我厂产品中的应用刘岩，胡世红１前言去年６月，我厂从美国ＥＤＳ公司购买Ｔ８套ＣＡＤ／ＣＡＭ／ＣＡＥ软件和１套美国ＭＳＣ公司的外置求解器——一ＮＡＳＴＲＡＮ，以及它自备的前后处理软件ＸＬ。一年多来，在厂各级领导的关心下，ＣＡＤ技术在...     

Effects of Coal—Water Mixture Properties in Atomization

ＥｆｆｅｃｔｓｏｆＣｏａｌ－ＷａｔｅｒＭｉｘｔｕｒｅＰｒｏｐｅｒｔｉｅｓｉｎＡｔｏｍｉｚａｔｉｏｎ￥ＤａｖｉｄＪ．Ｗｉｌｄｍａｎ；ＪａｍｅｓＭ．Ｅｋｍａｎｎ（ＰｉｔｔｓｂｕｒｇｈＥｎｅｒｇｙＴｅｃｈｎｏｌｏｇｙＣｅｎｔｅｒ，Ｕ．Ｓ．Ｄｅｐａｒｔｍｅｎ...     

A Simple Method of Flow Field Diagnosis in Multistage Axial Flow Compressors

ＡＳｉｍｐｌｅＭｅｔｈｏｄｏｆＦｌｏｗＦｉｅｌｄＤｉａｇｎｏｓｉｓｉｎＭｕｌｔｉｓｔａｇｅＡｘｉａｌＦｌｏｗＣｏｍｐｒｅｓｓｏｒｓＪｉｅＬｉｕ；ＤａｊｕｎＹｅ（ＤｅｐａｒｔｍｅｎｔｏｆＴｈｅｒｍａｌＥｎｇｉｎｅｅｒｉｎｇ，ＴｓｉｎｇｈｕａＵｎｉｖｅｒ...     

Numerical Simulation of a Negative Impulsive Wave

ＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｉｏｎｏｆａＮｅｇａｔｉｖｅＩｍｐｕｌｓｉｖｅＷａｖｅＴｏｓｈｉａｋｉＳＥＴＯＧＵＣＨＩ；ＭａｎａｂｕＴＡＫＡＯ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｍｅｅｒｉｎｇ，ＳａｇａＵｎｉｖｅｒｓｉｔｙ，Ｈｏｎｊ...     

High Heat Flux Burnout in Subcooled Flow Boiling

ＨｉｇｈＨｅａｔＦｌｕｘＢｕｒｎｏｕｔｉｎＳｕｂｃｏｏｌｅｄＦｌｏｗＢｏｉｌｉｎｇＧ．Ｐ．Ｃｅｌａｔａ；Ｍ．Ｃｕｍｏ；Ａ．Ｍａｒｉａｎｉ（ＥＮＥＡＥｎｅｒｇｙＤｅｐａｒｔｍｅｎｔ，ＶｉａＡｎｇｕｉｌｌａｒｅｓｅ，３０１Ｉ－０００６０Ｓ．Ｍ．Ｇａｌｅｒ...     

The Thermal Behavior of Coal—Ash Deposits on Heat Exchangers

ＴｈｅＴｈｅｒｍａｌＢｅｈａｖｉｏｒｏｆＣｏａｌ－ＡｓｈＤｅｐｏｓｉｔｓｏｎＨｅａｔＥｘｃｈａｎｇｅｒｓ￥ＪａｍｅｓＬ．Ｓ．Ｃｈｅｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，ＵｎｉｖｅｒｓｉｔｙｏｆＰｉｔｔｓｂｕｒｇｈ，Ｐ...     

动态数据交换（DDE）技术的研究与应用

本文阐述了在Ｗｉｎｄｏｗｓ环境下，使用动态数据交换（ＤＤＥ）技术进行应用程序之间交换数据的方法，并结合实际给出了ＶｉｓｕａｌＢａｓｉｃ（ＶＢ）程序作为用户应用程序、Ｉｎｔｅｌｌｕｔｉｏｎ的ＦＩＸＤＭＡＣＳ作为服务器应用程序实现ＤＤＥ的实例。     

工业锅炉CAD系统——结构设计及热力计算

结合ＣＡＤ技术，采用Ａｕｔｏｌｉｓｐ语言对工业锅炉进行结构设计计算，同时采用ＦＯＸＢＡＳＥ语言对相应的锅炉进行热力计算。设计计算信息以图形文件及数据库文件的形式存取，能直接形成热力计算书并为工业ＣＡＤ成图提供主要的结构尺寸数据。     

SURFCAM与Pro/ENGINEER在三维造型和加工方面的性能比较

本文介绍了ＳＵＲＦＣＡＭ、Ｐｒｏ／ＥＮＧＩＮＥＥＲ各自的主要功能和特点,还以Ｃ１２１－ ＤＵ－Ｄ３７连杆体锻模为例, 从三维几何造型、 加工参数的选择以及生成刀具加工轨迹等几个方面,对ＳＵＲＦＣＡＭ与Ｐｒｏ／ＥＮＧＩＮＥＥＲ进行了详细而又具体的分析和比较。     

Ash-forming elements in four Scandinavian wood species. Part 1: Summer harvest

Woody biomass in Finland and Sweden comprises mainly four wood species: spruce, pine, birch and aspen. To study the ash, which may cause problems for the combustion device, one tree of each species were cut down and prepared for comparisons with fuel samples. Well-defined samples of wood, bark and foliage were analyzed on 11 ash-forming elements: Si, Al, Fe, Ca, Mg, Mn, Na, K, P, S and Cl. The ash content in the wood tissues (0.2–0.7%) was low compared to the ash content in the bark tissues (1.9–6.4%) and the foliage (2.4–7.7%). The woods’ content of ash-forming elements was consequently low; the highest contents were of Ca (410–1340 ppm) and K (200–1310), followed by Mg (70–290), Mn (15–240) and P (0–350). Present in the wood was also Si (50–190), S (50–200) and Cl (30–110). The bark tissues showed much higher element contents; Ca (4800–19,100 ppm) and K (1600–6400) were the dominating elements, followed by Mg (210–2400), P (210–1200), Mn (110–1100) and S (310–750), but the Cl contents (40–330) were only moderately higher in the bark than in the wood. The young foliage (shoots and deciduous leaves) had the highest K (7100–25,000 ppm), P (1600–5300) and S (1100–2600) contents of all tissues, while the shoots of spruce had the highest Cl contents (820–1360) and its needles the highest Si content (5000–11,300). This paper presented a new approach in fuel characterization: the method excludes the presence of impurities, and focus on different categories of plant tissues. This made it possible to discuss the contents of ash element in a wide spectrum of fuel-types, which are of large importance for the energy production in Finland and Sweden.     

NEXT GENERATION ENGINEERED MATERIALS FOR ULTRA SUPERCRITICAL STEAM TURBINES

正1 ABSTRACT To reduce the effect of global warming on our climate,the levels of CO2emissions should be reduced.One way to do this is to increase the efficiency of electricity production from fossil fuels.This will in turn reduce the amount of CO2emissions for a given power output.Using US practice for efficiency calculations,then a move from a typical US plant running at 37%efficiency to a 760℃/38.5 MPa(1 400/5 580 psi)plant running at 48%efficiency would reduce CO2emissions by 170kg/MW.hr or 25%.     

Performance assessment of some ice TES systems

In this paper, a performance assessment of four main types of ice storage techniques for space cooling purposes, namely ice slurry systems, ice-on-coil systems (both internal and external melt), and encapsulated ice systems is conducted. A detailed analysis, coupled with a case study based on the literature data, follows. The ice making techniques are compared on the basis of energy and exergy performance criteria including charging, discharging and storage efficiencies, which make up the ice storage and retrieval process. Losses due to heat leakage and irreversibilities from entropy generation are included. A vapor-compression refrigeration cycle with R134a as the working fluid provides the cooling load, while the analysis is performed in both a full storage and partial storage process, with comparisons between these two. In the case of full storage, the energy efficiencies associated with the charging and discharging processes are well over 98% in all cases, while the exergy efficiencies ranged from 46% to 76% for the charging cycle and 18% to 24% for the discharging cycle. For the partial storage systems, all energy and exergy efficiencies were slightly less than that for full storage, due to the increasing effect wall heat leakage has on the decreased storage volume and load. The results show that energy analyses alone do not provide much useful insight into system behavior, since the vast majority of losses in all processes are a result of entropy generation which results from system irreversibilities.     

Aerodynamic performance effects of leading-edge geometry in gas-turbine blades

The purpose of this paper is to illustrate the advantages of the direct surface-curvature distribution blade-design method, originally proposed by Korakianitis, for the leading-edge design of turbine blades, and by extension for other types of airfoil shapes. The leading edge shape is critical in the blade design process, and it is quite difficult to completely control with inverse, semi-inverse or other direct-design methods. The blade-design method is briefly reviewed, and then the effort is concentrated on smoothly blending the leading edge shape (circle or ellipse, etc.) with the main part of the blade surface, in a manner that avoids leading-edge flow-disturbance and flow-separation regions. Specifically in the leading edge region we return to the second-order (parabolic) construction line coupled with a revised smoothing equation between the leading-edge shape and the main part of the blade. The Hodson–Dominy blade has been used as an example to show the ability of this blade-design method to remove leading-edge separation bubbles in gas turbine blades and other airfoil shapes that have very sharp changes in curvature near the leading edge. An additional gas turbine blade example has been used to illustrate the ability of this method to design leading edge shapes that avoid leading-edge separation bubbles at off-design conditions. This gas turbine blade example has inlet flow angle 0°, outlet flow angle −64.3°, and tangential lift coefficient 1.045, in a region of parameters where the leading edge shape is critical for the overall blade performance. Computed results at incidences of −10°,   −5°,   +5°,   +10° are used to illustrate the complete removal of leading edge flow-disturbance regions, thus minimizing the possibility of leading-edge separation bubbles, while concurrently minimizing the stagnation pressure drop from inlet to outlet. These results using two difficult example cases of leading edge geometries illustrate the superiority and utility of this blade-design method when compared with other direct or inverse blade-design methods.     

Effect of co-cultivation of Chlamydomonas reinhardtii with Azotobacter chroococcum on hydrogen production

Chlamydomonas reinhardtii cc124 and Azotobacter chroococcum bacteria were co-cultured with a series of volume ratios and under a variety of light densities to determine the optimal culture conditions and to investigate the mechanism by which co-cultivation improves H₂ yield. The results demonstrated that the optimal culture conditions for the highest H₂ production of the combined system were a 1:40 vol ratio of bacterial cultures to algal cultures under 200 μE m^?2 s^?1. Under these conditions, the maximal H₂ yield was 255 μmol mg^?1 Chl, which was approximately 15.9-fold of the control. The reasons for the improvement in H₂ yield included decreased O₂ content, enhanced algal growth, and increased H₂ase activity and starch content of the combined system.     

Natural-gas fueled spark-ignition (SI) and compression-ignition (CI) engine performance and emissions

Natural gas is a fossil fuel that has been used and investigated extensively for use in spark-ignition (SI) and compression-ignition (CI) engines. Compared with conventional gasoline engines, SI engines using natural gas can run at higher compression ratios, thus producing higher thermal efficiencies but also increased nitrogen oxide (NO_x) emissions, while producing lower emissions of carbon dioxide (CO₂), unburned hydrocarbons (HC) and carbon monoxide (CO). These engines also produce relatively less power than gasoline-fueled engines because of the convergence of one or more of three factors: a reduction in volumetric efficiency due to natural-gas injection in the intake manifold; the lower stoichiometric fuel/air ratio of natural gas compared to gasoline; and the lower equivalence ratio at which these engines may be run in order to reduce NO_x emissions. High NO_x emissions, especially at high loads, reduce with exhaust gas recirculation (EGR). However, EGR rates above a maximum value result in misfire and erratic engine operation. Hydrogen gas addition increases this EGR threshold significantly. In addition, hydrogen increases the flame speed of the natural gas-hydrogen mixture. Power levels can be increased with supercharging or turbocharging and intercooling. Natural gas is used to power CI engines via the dual-fuel mode, where a high-cetane fuel is injected along with the natural gas in order to provide a source of ignition for the charge. Thermal efficiency levels compared with normal diesel-fueled CI-engine operation are generally maintained with dual-fuel operation, and smoke levels are reduced significantly. At the same time, lower NO_x and CO₂ emissions, as well as higher HC and CO emissions compared with normal CI-engine operation at low and intermediate loads are recorded. These trends are caused by the low charge temperature and increased ignition delay, resulting in low combustion temperatures. Another factor is insufficient penetration and distribution of the pilot fuel in the charge, resulting in a lack of ignition centers. EGR admission at low and intermediate loads increases combustion temperatures, lowering unburned HC and CO emissions. Larger pilot fuel quantities at these load levels and hydrogen gas addition can also help increase combustion efficiency. Power output is lower at certain conditions than diesel-fueled engines, for reasons similar to those affecting power output of SI engines. In both cases the power output can be maintained with direct injection. Overall, natural gas can be used in both engine types; however further refinement and optimization of engines and fuel-injection systems is needed.     

Hydrogen production by steam-gasification of carbonaceous materials using concentrated solar energy – V. Reactor modeling,optimization, and scale-up

A chemical reactor for the steam-gasification of carbonaceous particles (e.g. coal, coke) is considered for using concentrated solar radiation as the energy source of high-temperature process heat. A two-phase reactor model that couples radiative, convective, and conductive heat transfer to the chemical kinetics is applied to optimize the reactor geometrical configuration and operational parameters (feedstock's initial particle size, feeding rates, and solar power input) for maximum reaction extent and solar-to-chemical energy conversion efficiency of a 5 kW prototype reactor and its scale-up to 300 kW. For the 300 kW reactor, complete reaction extent is predicted for an initial feedstock particle size up to 35 μm at residence times of less than 10 s and peak temperatures of 1818 K, yielding high-quality syngas with a calorific content that has been solar-upgraded by 19% over that of the petcoke gasified.     

Assessment methods of material ageing using Sdobyrev''s creep rupture model

The physical aspects of the activation energy, in higher and high temperatures, of the metal creep process were examined. The research results of creep-rupture in a uniaxial stress state and the criterion of creep-rupture in biaxial stress states, at two temperatures, are then presented. For these studies creep-rupture, taking case iron as an example the energy and pseudoenergy activation was determined. For complex stress states the criterion of creep-rupture was taken to be Sdobyrev's, i.e. σ_red = σ₁ β + (1 − β)σ_i, where: σ₁-maximal principal stress, σ_i-stress intensity, β-material constant (at variable temperature β = β(T)). The methods of assessment of the material ageing grade are given in percentages of ageing of new material in the following mechanical properties: 1) creep strength in uniaxial stress state, 2) activation energy in uniaxial stress state, 3) criterion creep strength in complex stress states, 4) activation pseudoenergy in complex stress states. The methods 1) and 3) are the relatively simplest because they result from experimental investigations only at nominal temperature of the structure work, however, for methods 2) and 4) it is necessary to perform the experimental investigations at least at two temperatures.     

Production of hydrogen from sewage biosolids in a continuously fed bioreactor: Effect of hydraulic retention time and sparging

Hydrogen was produced from primary sewage biosolids via mesophilic anaerobic fermentation in a continuously fed bioreactor. Prior to fermentation the sewage biosolids were heated to 70 °C for 1 h to inactivate methanogens and during fermentation a cellulose degrading enzyme was added to improve substrate availability. Hydraulic retention times (HRT) of 18, 24, 36 and 48 h were evaluated for the duration of hydrogen production. Without sparging a hydraulic retention time of 24 h resulted in the longest period of hydrogen production (3 days), during which a hydrogen yield of 21.9 L H₂ kg⁻¹ VS added to the bioreactor was achieved. Methods of preventing the decline of hydrogen production during continuous fermentation were evaluated. Of the techniques evaluated using nitrogen gas to sparge the bioreactor contents proved to be more effective than flushing just the headspace of the bioreactor. Sparging at 0.06 L L min⁻¹ successfully prevented a decline in hydrogen production and resulted in a yield of 27.0  L H₂ kg⁻¹ VS added, over a period of greater than 12 days or 12 HRT. The use of sparging also delayed the build up of acetic acid in the bioreactor, suggesting that it serves to inhibit homoacetogenesis and thus maintain hydrogen production.     

汽轮机数字电液调节系统挂闸异常的技术完善

分析了200MW汽轮机数字电液调节系统在运行中存在的挂闸异常问题,采取了相应的技术处理措施,且运行实践效果良好。