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首页> 外文期刊>Applied Mathematical Modelling >Effects of engine design and operating parameters on the performance of a spark ignition (SI) engine with steam injection method (SIM)
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Effects of engine design and operating parameters on the performance of a spark ignition (SI) engine with steam injection method (SIM)

机译：发动机设计和运行参数对采用蒸汽喷射法（SIM）的火花点火（SI）发动机性能的影响

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摘要

The effects of engine design and operating parameters such as equivalence ratio (ER), compression ratio (CR), cycle pressure ratio (CPR), cycle temperature ratio (CTR), bore-stroke length ratio (D/L) inlet pressure, inlet temperature, friction coefficient (FC), mean piston speed (MPS) and engine speed on the performance characteristics such as brake thermal efficiency (BTE) and brake power output (BPO) are investigated for a steam injected gasoline engine (SIGE) with a simulation model validated with experiments using a realistic finite-time thermodynamics model (FTTM). Moreover, the energy losses arising from exhaust output (EO), heat transfer (HT), friction (FR) and incomplete combustion (IC), are illustrated by using graphs. The optimum values of engine speed, compression ratio, equivalence ratio, cycle temperature ratio and pressure ratio are presented by grid curves. Also, they are called performance maps. The results showed that the performance characteristics improve with enhancing inlet pressure, cycle pressure ratio and cycle temperature ratio; with diminishing inlet temperature and friction coefficient. The BPO can be increased up to 42%, 55% and 62% by using the optimum values of cycle pressure ratio, cycle temperature ratio and inlet pressure, respectively. Also, the BTE can be increased up to 8%, 12% and 15%, by the same way. On the other hand, the performance characteristics can improve or deteriorate with respect to different conditions of compression ratio, engine speed, equivalence ratio, stroke length and mean piston speed. Therefore, the optimum values should be determined to obtain the maximum performance conditions.
机译：发动机设计和运行参数的影响，例如当量比（ER），压缩比（CR），循环压力比（CPR），循环温度比（CTR），缸径长度比（D / L）入口压力，入口通过仿真研究了温度，摩擦系数（FC），平均活塞转速（MPS）和发动机转速对性能特性（例如制动热效率（BTE）和制动功率输出（BPO））的影响，使用实际的有限时间热力学模型（FTTM）通过实验验证的模型。此外，使用图表说明了由排气输出（EO），传热（HT），摩擦（FR）和不完全燃烧（IC）引起的能量损失。网格曲线给出了发动机转速，压缩比，当量比，循环温度比和压力比的最佳值。同样，它们被称为性能图。结果表明，随着进口压力，循环压力比和循环温度比的提高，性能特征得到改善。降低进口温度和摩擦系数。通过使用循环压力比，循环温度比和入口压力的最佳值，可以将BPO分别提高到42％，55％和62％。同样，BTE可以通过相同的方式提高到8％，12％和15％。另一方面，相对于压缩比，发动机速度，当量比，冲程长度和平均活塞速度的不同条件，性能特性可以改善或恶化。因此，应该确定最佳值以获得最大性能条件。

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