发动机热效率

分析了不同LPG质量掺混比对发动机热效率、排放特性和燃烧特性的影响。

It analyzes the effects of LPG blended ratio on the effective heat efficiency , emission performances and combustion characteristics .

结果表明，在柴油中添加DMC，燃料十六烷值降低，发动机热效率提高，烟度减小。

The results show that the fuel cetane number and engine exhaust smoke decrease and engine thermal efficiency improves with adding DMC in diesel fuel .

在低负荷工况采用DME／甲醇双燃料会导致过低的发动机热效率，宜燃用单一DME燃料并采用大比例EGR方案来改善热效率。

For light load , low thermal efficiency results from DME / methanol dual fuel , So pureDME with high EGR rate may be a good choice for HCCI operation .

整体运行DECC可以将发动机热效率提高6%以上。

And the thermal efficiency of DECC engine can be improved 6 % higher than the baseline engine generally .

提高沼气柴油双燃料发动机热效率的试验研究

An Experimental Investigation on Increasing Thermal Efficiency of a Dual Fuel-biogas Engine

适当增加供油提前角可使柴油/甲醇混合燃料发动机热效率提高。

Further advancement of fuel delivery advance angle would achieve a better engine thermal efficiency when operating on the diesel / methanol blends .

面对能源形势和环境保护的双重挑战，提高发动机热效率和降低排放已经成为一条主要的应对途径。

With challenges of energy situation and environment protection , improving engine thermal efficiency and reducing emissions have become a main approach to deal with these problems .

燃烧放热率作为反映燃烧过程的关键参数，影响着发动机热效率、机械负荷及排放特性，燃烧过程优化是实现柴油机高效清洁燃烧的途径之一。

As one of the crucial parameters that could reflect the combustion process , heat release characteristic greatly influences the thermal efficiency , mechanical load and emissions of diesel engine .

陶瓷材料的应用，对减轻车辆自身质量、提高发动机热效率、降低油耗、减少排气污染、提高易损件寿命、完善汽车智能性功能等都有积极意义。

The ceramic material used in the automotives can contribute to reduce the dead weight of vehicle , improve engine hot efficiency , reduce oil consumption , reduce emission , increase the life of quick-wear parts and perfect the intelligent function of automobiles .

试验结果表明燃用甲醇裂解燃料比燃用甲醇蒸汽燃料发动机热效率较高、排放较低。由发动机工作过程热力学循环分析结果表明，发动机燃用裂解燃料时性能较好的主要原因是实现了快速燃烧与稀薄燃烧。

The test results showed an improvement in brake efficiency and exhaust emissions when the engine was fueled with DM instead of VM , Thermodynamic analyses revealed that the main factors responsible for higher efficiency of DM engine are faster and leaner burning .

高负荷时发动机有效热效率增加而CO排放基本相当。

However , the brake thermal efficiency increases and the CO emissions almost equal at high loads .

不同醇类燃料对发动机指示热效率的影响不同。

Different alcohol-gasoline blends have different impact on the indicated thermal efficiency of the engine .

提高发动机的热效率，改善其性能一直是人们所追求的。

Increasing engine thermal efficiency and improving its performance have been pursued by the people for long .

本文概述提高汽车燃油经济性的方法，减少汽车自重，提高发动机的热效率和传动效率，减少汽率运动阻力等，最后对现在进行的混合动力汽车的研究作了讨论。

In this paper , methods to improve automotive fuel economy were introduced , i. e , lower curb weight , raise engine thermal efficiency and transmission efficiency , reducing car moving resistance , etc. Finally recent research about hybrid powered motor vehicles was discussed .

涡轮增压发动机理想循环热效率的一种分析方法

Calculation of Ideal Cycle Efficiency of Turbocharged Engine

为改善现有点燃式天然气发动机存在的热效率低、功率密度低的缺点，研究开发新型燃烧系统是天然气发动机面临的科学问题。

To improve thermal efficiency and power density from the spark ignition engine , developing a new combustion system is a scientific issue which lies in front of the researchers .

稀燃天然气发动机具有较高的热效率和较低的NOx排放。

Lean burn natural gas engines have high thermal efficiency and low NOx emissions .

微乳化燃料获得了与柴油相近的发动机动力性和热效率，NOX排放比燃用柴油时高，碳烟排放比燃用柴油时低。

Engine fueled with micro-emulsified fuels gets higher power output and thermal efficiency , higher NO_X emission , lower soot emission than diesel .

模拟计算结果显示，标定工况下复合发动机的整机指示热效率达50%。

Based on the calculation results of the models , the indicated thermal efficiency rate is50 % under the rated condition .

电控可变气门系统是改善发动机性能、提高热效率和减少其有害排放物最有效的技术之一。

The common-rail ( CR ) electronically controlled variable valve system is one of the most effective technologies to enhance the engine performance and reduce harmful matter .

使用陶瓷材料制造发动机零件可以提高发动机功率和热效率，减少重量及噪音，是汽车发动机的发展方向。

Using ceramic materials to make automobile engine pans can increase the ermine horsepower and thermal efficiency and decrease the engine weight and its running noise ; and therefore is the tendency of automobile engine development .

通过实验，得出了发动机转速与热泵性能系数、发动机热效率的关系曲线，并进行了分析。

Through experiment , the relation figures of engine rotation speed , coefficient of performance of heat pump and engine thermal efficiency are presented and analyzed .

阐述了脉冲爆震发动机工作原理，对脉冲爆震发动机热效率、循环过程及性能进行了初步分析。

This paper describes the principles of pulsed detonation engines ( PDE ) A preliminary analysis on thermal efficiency , cycle process and Performance Of pulsed detonation engines has been made .

研究发现：乙醇柴油混合燃料能有效降低柴油发动机的碳烟排放，并改善发动机的热效率，发动机的动力性能不会受到明显影响，是一种良好的柴油含氧燃料，具有良好的推广应用前景。

The results showed that using the oxygenated ethanol / diesel compounds as fuel , the engine emission can be reduced and combustion be improved while the engine power hardly influenced .

发动机制造技术的进步，使发动机功率和热效率提高的同时，也使气缸内的燃烧温度和压力越来越高，这必然使发动机承受更高的热负荷和更大的机械负荷。

Improvements in engine manufacturing technology have gradually increased the thermal efficiencies of engines as well as the burning temperature and pressure of fuels within the cylinders . And this makes the engine bear higher heat load and mechanical load than before .

试验表明，电控喷气可以明显改善双燃料发动机的燃料经济性和排放性能，提高发动机的热效率。合理选择喷射压力和喷射相位可有效地提高燃烧速度和燃烧稳定性。

Experiments of the dual fuel engine with the injection system proved that the electronically controlled natural gas injection could improve the performance of dual fuel engines , especially in increasing combustion speed , fuel economy , the combustion stability and lowering emissions .

深入理解热声发动机的振荡机理，对于降低热声发动机的起振温度和提高发动机的热声转换效率具有重要的意义。

The study on oscillation mechanism of a thermoacoustic engine is of importance for lowering the onset temperature and improving the thermal efficiency of the engine .

对高频热声斯特林发动机和高频驻波发动机驱动同一台脉冲管制冷机进行了实验对比，表明高频热声斯特林发动机的热效率高于高频驻波热声发动机。

The preliminary experimental comparison between high frequency thermoacoustic-Stirling heat engine and standing-wave thermoacoustic heat engine indicated that the former has higher thermal efficiency over the latter .