汽车空调平行流式冷凝器空气侧性能研究

建立了平行流冷凝器的数学模型,根据所建模型得到的计算结果和试验结果对比,其误差范围在5%内.并针对迎面风速对冷凝器性能影响进行了分析,为平行流式冷凝器性能优化设计提供了重要的参考.     

平行流式冷凝器的热力性能研究

对平行流式冷凝器热力性能进行了理论和试验分析,得出了影响平行流式冷凝器热力性能的因素,并提出了优化平行流式冷凝器热力性能的措施,为平行流式冷凝器的优化设计提供了理论参考。     

平行流冷凝器制造工艺研究

通过对冷凝器的生产制造工艺进行研究和分析,并提出工艺改进的具体方案,研究对提高平行流冷凝器的生产效率和产品质量有较好的指导意义。     

热力式散流器性能的实验研究

给出了采用热力式散流器与常规散流器送热风时的温度场、速度场的分布及包络线图,并对其空气流动力持性、热舒适度和节能进行了分析。     

汽车空调平行流冷凝器的轻量化研究

通过综合目前汽车空调冷凝器应用研究的状况,对平行流式冷凝器的结构进行研究,简要的介绍一种目前汽车空调平行流冷凝器的轻量化应用技术。对于汽车空调用的平行流式冷凝器的优化设计及汽车零部件的轻量化有一定的参考作用。     

双半月型超薄多微孔平行流冷凝器的研究开发

研制了用于汽车空调系统的双半月型超薄多微孔平行流冷凝器,简要介绍了其性能优势、结构特点、关键技术及其推广应用前景。     

论平行流蒸发器分流板位置变化对性能的影响

针对平行流蒸发器中分流板位置、孔径大小对平行流蒸发器性能影响进行分析,并得出结论,合理的分流板位置及大小对蒸发器性能及表面温度分布均匀状态有相当大的改善.     

基于CFD的水冷板热力性能仿真研究

水冷板是新能源车辆的关键部件,其换热性能直接影响了冷却系统的效能。利用CFD技术对某款水冷板的热力性能进行了分析研究。首先,建立其3D简化模型,并利用前处理软件生成网格;然后在Fluent 15.0中模拟特定工况下的性能,经20 000步迭代收敛后,输出计算结果。通过分析结果可知,当前水冷板流道内平均流速为0.16 m/s,换热量为4 883.25 J,压力损失为394.84 Pa,可以满足高效工作下的散热需求。     

汽车空调平行流式冷凝器优化换热的研究

建立平行流式冷凝器翅片的数学模型,应用Fluent软件对影响风冷式冷凝器传热的风速、翅片高度、翅片间距、翅片厚度、翅片接触面宽度等因素进行模拟计算研究,得出反映影响平行流式冷凝器传热的流场特性和传热特性的数据.该研究对设计平行流式冷凝器和优化平行流式冷凝器的换热起到一定参考作用.     

对流层海拔高度对压缩机热力性能的影响

描述了大气状态参数变化的规律,并通过理论分析说明了海拔高度变化引起的温度、压力和密度的变化对压缩机排气量、排气温度和轴功率的影响。     

Experimental study on natural convection heat transfer from horizontal cylinders with longitudinal plate fins

The purpose of this study was to investigate the effect of various fin numbers, fin heights, and base temperatures on natural convection from horizontal cylinders with longitudinal plate fins experimentally. Experimental results were used to establish a correlation for estimating the Nusselt number under the following conditions: Rayleigh number, 300000–1000000; fin-height-to-cylinder-diameter ratio, 1/6–1/2; and fin number, 9–72. In addition, a contour map was developed to describe the thermal resistance as a function of the fin number and fin thickness.     

微沟槽热管传热性能实验研究

为研究充液率、真空度和长度对热管传热性能的影响作用,利用基于虚拟仪器技术的热管传热性能测试平台对直径6mm的微梯形沟槽热管在不同充液率、不同真空度以及不同长度等条件下进行实验测试.实验表明:微沟槽热管的最佳充液率在(75～100)%之间.热管内必须具备足够低的真空度,且充液率需根据真空度的不同适当调整.热管长度缩短可以提高其传热性能,但长度较短时,需适当提高充液率.     

Experimental investigation on the airside performance of fin-and-tube heat exchangers having herringbone wave fins and proposal of a new heat transfer and pressure drop correlation

The heat transfer and friction characteristics of fin-and-tube heat exchangers having herringbone wave fins were experimentally investigated. Eighteen samples having different fin pitches (1.34 mm to 2.54 mm) and tube rows (one to four) were tested. For all the samples, the waffle depth and the corrugation angle of the fin was 1.14 mm and 11.7^o respectively. Results showed that the j factors were insensitive to fin pitch, while f factors increased as the fin pitch increased. As the number of tube rows increased, both the j and f factors decreased. However, the effect of tube row diminished as the Reynolds number increased, at least for j factors. Existing correlations failed to adequately predict the present data. A new correlation was developed based on existing data, which significantly improved the predictions of the present data.     

典型波纹翅片单元流动与传热特性的数值研究

以两种典型的波纹翅片单元为研究对象,在合理简化条件下给出了物理模型和数学模型,通过流固界面的传热耦合,对不同进口风速下波纹翅片单元的流动及传热和阻力特性进行了数值研究.通过对传热系数,Nu数、压降以及涡量分布的对比分析,结果表明:人字形翅片的传热性能优于波浪形翅片,而流动阻力性能却没有明显的劣势,其主要原因是翅片流场中涡流的产生与耗散存在差异.     

Experimental study on heat transfer characteristics of water-spray-bed heat exchanger

An experimental study was conducted on a water-spray-bed heat exchanger to investigate the heat transfer characteristics. A laboratory-scale test rig was built and its heat transfer characteristics were investigated with respect to various design and operation parameters such as the water spray flow rate, exhaust gas flow rate and number of tube rows. It was found that the implementation of the water spray increased the heat transfer rate to about 1.3 - 2.2 times that of a heat exchanger without water spray, although with a slight increase in the pressure loss. It was thus confirmed that the water spray was effective for enhancing condensing heat recovery from an exhaust gas.

     

An efficient method to predict the heat transfer performance of a louver fin radiator in an automotive power system

A numerical method to efficiently predict heat transfer phenomena of a louver fin radiator was presented — multi-scale semimicroscopic heat exchange (SHE) method. This method consists of microscopic analysis and semimicroscopic analysis. To predict heat transfer characteristics of a louver fin element, the microscopic analysis employs modeling of the detailed geometry of a fin element. Numerical models for the heat transfer rate and flow friction derived from the microscopic analysis are then used for simulations of the full radiator model in semimicroscopic analysis. In the semimicroscopic analysis, conjugate heat transfer is analyzed for the domain with the radiator whose louver fin area is replaced by a porous media. The results with the proposed method show a good agreement with the experimental data. The proposed method can be used to predict flow and heat transfer characteristics of a realistic louver fin radiator with a reduced cost and sufficient accuracy.     

不同工质沟槽式微热管传热性能实验研究

为了研究工质对沟槽式微热管传热性能的影响,通过试验对不同充液率下,不同工质对沟槽式微热管的温差、热阻与极限功率等性能的影响进行研究.结果表明:充液率对丙酮热管的温差变化影响较大,在相同情况下,丙酮热管需要更高的充液率.乙醇热管的温差性能较差,但充液率小的乙醇热管其热阻较小.水热管的极限功率最高,且在100%的充液率时,有着最为良好的传热性能,较另两种工质更适合用于高功率场合.该研究对实际生产和应用中的工质选择有着重要的参考意义.     

Experimental investigation of heat transfer enhancement in a circular duct with circumferential fins and circular disks

The characteristics of heat transfer and pressure drop for fully developed turbulent flow in a tube with circumferential fins and circular disks were experimentally studied. The various spacing and sizes of circumferential fins and circular disks were selected as design parameters, while the effects of these parameters on heat transfer enhancement and pressure drop were investigated. In order to quantify the effect of heat transfer enhancement and the increase of pressure drop due to the fins and disks in a tube, the Nusselt numbers and the friction factors for various configurations and operating conditions were compared to those for a corresponding smooth tube. The results showed that the heat transfer rate was significantly enhanced by increasing the height of circumferential fins and decreasing the pitch of circumferential fins. On the other hand, the influence of the disk size and the fin-disk spacing were not significant. Based on the experimental results, a correlation for estimating the Nusselt number was suggested.     

翅片热板散热器的传热数值模拟研究

采用有限元法,应用ANSYS软件的热分析功能对翅片热板散热器的传热性能进行了数值模拟,并计算出该散热器表面的瞬态温度变化曲线,与实验测试结果吻合得较好.最后的研究结果表明:所研制的新型功率电子元器件翅片热板散热器散热性能良好,具有良好的启动性能和等温性能.     

翅片热板散热器的传热研究

在已设计的翅片热板散热器基础上进行了传热性能实验,对于充装不同工质、工质充装量、翅片热板散热器的工作方式等因素都进行了较深入的传热测试,分析这些因素对翅片热板散热器传热性能的影响.同时对翅片热板散热器的瞬态和稳态传热性能也进行了实验测试,分析了瞬态、稳态表面温度变化曲线,并进行了传热性能比较分析,讨论了工质充装量、倾斜角度等对翅片热板散热器传热性能的影响.