LPG进气道液态喷射的实验研究

设计了LPG低压液态喷射的燃料供应系统和控制系统，对LPG进气道液态喷射进行了实验研究，将液态喷射与气态喷射及燃用汽油时的动力性，排放作了对比，研究了空燃比对LPG液态喷射发动机性能的影响。结果表明：采用液态喷射方式具有良好的动力性，与燃用汽油相比污染物排放得到很大改善，与气态喷射相比HC排放量略有上升，NOx下降，空燃比对发动机性能的影响与燃用汽油时基本一致。     

摩托车发动机电控喷射LPG/汽油双燃料系统的试验研究

介绍了电控喷射LPG／汽油双燃料系统及控制方法,并进行了系统和原机对比的排放试验及LPG喷射量对发动机性能的影响试验。试验结果表明：LPG／汽油双燃料系统可以大幅降低CO、HC排放;在稳态工况下,较小的LPG喷气量变化,对发动机混合气空燃比和动力性影响不大,而对排放性能影响较大。     

汽油发动机燃用LPG的燃烧性能数值模拟及试验研究

应用GT-POWER软件和化学动力学软件CHEMKIN建立了汽油发动机工作过程计算模型,并用试验结果进行了验证。在此基础上对汽油发动机燃烧LPG时的动力性能及经济性能进行了变参数研究。模拟结果表明,在相同工况条件下,随着压缩比的增大,燃用LPG发动机的经济性和动力性能都有所提高,但同时爆震指数也相应增加。随着空燃比的增加,发动机的经济性能和动力性能均先提高后降低,空燃比对缸内层流燃烧速度和绝热火焰温度影响较大。     

汽油—液化石油气（LPG）两用燃料发动机的研究

介绍了汽油－液化石油气（LPG）两用燃料发动机空燃比的调节和作者研制成功的无混合器式双蒸发器LPG供气系统,该供气系统取消了LPG发动机惯用的混合器,在原机双腔化油器的主、副腔喉管处钻孔,接入LPG主供气系和LPG加浓系,从而取消了混合器,解决了全负荷时动力性与部分负荷时燃料经济性、排放之间的矛盾,取得了良好的效果。用该系统改装的汽油－LPG两用燃料发动机,在燃用汽油时性能无任何变化,燃用LPG时取得了动力性、燃料经济性和排放指标俱佳的效果。     

LPG-汽油双燃料发动机试验研究

选用澳华液化石油气（LPG）有限公司生产的汽车用石油气燃料供给管理配于EQ6100－I型发动机，改装成LPG－汽油双燃料发动机，进行性能测试分析。试验结果表明，在不改变原机压缩比和点火提前角时，燃用液化石油气的动力性下降，最大功率为原机的90％；最大扭矩为原机的92％。燃用LPG比燃用汽油的当量比油耗低，节能率在5％左右。怠速排放试验表明，燃用LPG的CO，HC排放浓度分别为燃用贩50％和36％。     

火花点火缸内直喷灵活燃料发动机的开发

对一台采用火花点火、缸内直喷、周向分层燃烧系统的发动机在燃用甲醇、乙醇和汽油时系统参数进行优化,获得系统燃用这三种燃料时各自的最优参数。根据优化结果不同的参数对发动机性能影响的程度进行折中,获得灵活燃料发动机的系统参数,实现了在不改动发动机的前提下灵活燃用此三种燃料。发动机性能研究表明：由于采用分层燃烧,灵活燃料发动机具有与直喷柴油机相当的热效率,在负荷特性上,燃用醇类燃料和汽油时的NOx排放分别仅为柴油机的10％～40％和21％～78％,CO排放低于1％,HC排放略高于柴油机,燃用醇类燃料时可实现无烟燃烧,燃用汽油时仅在高负荷运转时存在少许碳烟。     

492Q汽油机燃用液化石油气质NOx排放规律的试验研究

介绍了在492Q汽油机上燃用液化石油气（LPG）的台架试验结果，得到了其在中高转速下NOx排放同空燃比、负荷以及点火提前角等参数之间的关系，并将试验结果同汽油机进行了对比。试验结果表明，汽油发动机机在燃用LPG燃料时，NOx排放会有所增加，需要采取某些措施来加以抑制。     

LPG／汽油双燃料发动机排放规律的试验研究

介绍LPG／汽油双燃料发动机的排放特性,主要分析燃用LPG时发动机的排放规律,并对比分析了燃用汽油和燃用LPG时发动机的排放规律。     

空燃比对LPG发动机排放特性影响的研究

介绍了与叉车配套的柴油机改装成燃用液化石油气（LPG）发动机的台架试验结果，作者针对叉车发动机的常用运行工况，采用宽域空燃比氧传感器（UEGO）的电控单元来控制发动机的空燃比，得到了在中，高转速下的HC，CO，NOx，排气温度同空燃比的关系，试验结果表明空燃比对LPG发动机排放影响极大，为了得到较好的排放性能，需要随工况的变化精确地控制空燃比。     

缸内直喷灵活燃料发动机性能和燃烧特性的研究

根据所测的示功图和排放结果,分析了一台采用火花点火、缸内直喷周向分层燃烧系统,能够灵活燃用甲醇、乙醇和汽油的发动机的性能和燃烧特性.研究表明,由于采用分层燃烧,灵活燃料发动机具有与直喷柴油机相当的热效率,在负荷特性上,燃用醇类燃料和汽油时的NOx排放分别仅为柴油机的10%～40%和21%～78%,CO排放低于1%,HC排放略高于柴油机,燃用醇类燃料时能实现无烟燃烧,燃用汽油时仅在高负荷时存在少许碳烟.灵活燃料发动机的燃烧由预混燃烧与扩散燃烧组成,具有非常快的燃烧速率,上止点后3～5°CA就燃烧完50%燃料,燃烧持续期在28～37°CA范围内,甲醇的燃烧速率最快,汽油的燃烧速率在低负荷时比乙醇稍快,在高负荷时比乙醇慢.     

Thermodynamic analysis of a Stirling engine including dead volumes of hot space, cold space and regenerator

This paper provides a theoretical investigation on the thermodynamic analysis of a Stirling engine. An isothermal model is developed for an imperfect regeneration Stirling engine with dead volumes of hot space, cold space and regenerator that the regenerator effective temperature is an arithmetic mean of the heater and cooler temperature. Numerical simulation is performed and the effects of the regenerator effectiveness and dead volumes are studied. Results from this study indicate that the engine net work is affected by only the dead volumes while the heat input and engine efficiency are affected by both the regenerator effectiveness and dead volumes. The engine net work decreases with increasing dead volume. The heat input increases with increasing dead volume and decreasing regenerator effectiveness. The engine efficiency decreases with increasing dead volume and decreasing regenerator effectiveness.     

Investigation on power output of the gamma-configuration low temperature differential Stirling engines

This paper provides a study on power output determination of a gamma-configuration, low temperature differential Stirling engine. The former works on the calculation of Stirling engine power output are discussed. Results from this study indicate that the mean pressure power formula is most appropriate for the calculation of a gamma-configuration, low temperature differential Stirling engine power output.     

The ANU solar thermal steam engine: performance analysis

This paper describes the results of a series of experiments that were performed to define the performance of the uniflow piston-operated valve steam engine developed by the Australian National University (ANU) for solar thermal applications. The results are fitted by least-squares regression to simple power series expressions that correlate the power output and engine inlet pressure to steam temperature, thermal power input and condenser pressure. The performance of the engine is examined by comparison with an idealized frictionless and quasi-static model. The idealized model is used to assess the relative importance of the effects of friction and non equilibrium thermodynamic conditions in the engine. The exergetic performance of the ideal engine is examined to demonstrate the fundamental limitations of this engine technology. It is concluded that high piston/cylinder forces during the first stages of expansion pose a significant barrier to the enhancement of engine efficiency through the use of higher temperatures and expansion ratios. © 1998 John Wiley & Sons, Ltd.     

国产航空斯贝发动机的工业及船用化发展

本文介绍了改型航空发动机应用概况,提出了航空斯贝发动机作母型机改装为工业和船用系列化机型的途径及优点。     

Energy system feasibility study of an Otto cycle/Stirling cycle hybrid automotive engine

The aim of this study was to investigate the feasibility of utilising a Stirling cycle engine as an exhaust gas waste heat recovery device for an Otto cycle internal combustion engine (ICE) in the context of an automotive power plant. The hybrid arrangement would produce increased brake power output for a given fuel consumption rate when compared to an ICE alone. The study was dealt with from an energy system perspective with design practicalities such as power train integration, location of auxiliaries, manufacture costs and other general plant design considerations neglected. The study necessitated work in two distinct areas: experimental assessment of the performance characteristics of an existing automotive Otto cycle ICE and mathematical modelling of the Stirling cycle engine based on the output parameters of the ICE. It was subsequently found to be feasible in principle to generate approximately further 30% useful power in addition to that created by the ICE by using a Stirling cycle engine to capture waste heat expelled from the ICE exhaust gases over the complete range of engine operating speeds.     

A four power-piston low-temperature differential Stirling engine using simulated solar energy as a heat source

In this paper, the performances of a four power-piston, gamma-configuration, low-temperature differential Stirling engine are presented. The engine is tested with air at atmospheric pressure by using a solar simulator with four different solar intensities as a heat source. Variations in engine torque, shaft power and brake thermal efficiency with engine speed and engine performance at various heat inputs are presented. The Beale number obtained from the testing of the engine is also investigated. The results indicate that at the maximum actual energy input of 1378 W and a heater temperature of 439 K, the engine approximately produces a maximum torque of 2.91 N m, a maximum shaft power of 6.1 W, and a maximum brake thermal efficiency of 0.44% at 20 rpm.     

Performance of a twin power piston low temperature differential Stirling engine powered by a solar simulator

This paper provides an experimental investigation on the performance of a low-temperature differential Stirling engine. In this study, a twin power piston, gamma-configuration, low-temperature differential Stirling engine is tested with non-pressurized air by using a solar simulator as a heat source. The engine testing is performed with four different simulated solar intensities. Variations of engine torque, shaft power and brake thermal efficiency with engine speed and engine performance at various heat inputs are presented. The Beale number, obtained from the testing of the engine, is also investigated. The results indicate that at the maximum simulated solar intensity of 7145 W/m², or heat input of 261.9 J/s, with a heater temperature of 436 K, the engine produces a maximum torque of 0.352 N m at 23.8 rpm, a maximum shaft power of 1.69 W at 52.1 rpm, and a maximum brake thermal efficiency of 0.645% at 52.1 rpm, approximately.     

三角转子发动机的特点及其发展概况综述

介绍了新型发动机——三角转子发动机的结构特点和工作过程,在与往复式发动机进行比较的基础上阐述了转子发动机的工作特点,并介绍了转子发动机的发展新技术和国内外发展状况,以及应努力的方向。     

我国高效利用燃料乙醇的建议

对比国外的发展情况,结合国情建议在柴油机上使用乙醇并提出具体的技术方法。在柴油机上使用乙醇,可以大幅度提高燃料效率,减少二氧化碳排放,其他排放也能随之改善。     

汽油机燃用乙醇汽油和无铅汽油的试验比较

在汽油机参数未作任何调整的情况下,试验研究了汽油机燃用乙醇汽油对发动机经济性和动力性的影响,并与燃用无铅汽油时的结果进行了对比分析。研究表明,在部分负荷下,汽油机的功率和转矩都有所降低,但在全负荷时发动机的输出功率不变;燃油消耗率会增加5％～10％,发动机的经济区范围变窄。