Effects of Compression Ratio and Ignition Timing on the Overall Performance of Hydrogen-Fueled Elliptical Rotary Engine

YANG Zhenghao; GENG Qi; JIA Guangyu; DU Yang; HE Guangyu

doi:10.7652/xjtuxb202506004

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Effects of Compression Ratio and Ignition Timing on the Overall Performance of Hydrogen-Fueled Elliptical Rotary Engine

Special Topic　Combustion Process | 更新时间：2025-08-26

- Effects of Compression Ratio and Ignition Timing on the Overall Performance of Hydrogen-Fueled Elliptical Rotary Engine
- Journal of Xi’an Jiaotong University Vol. 59, Issue 6, Pages: 32-41(2025)
- 作者机构：
  
  1.空军工程大学航空动力系统及等离子体技术全国重点实验室， 710038，西安
  2.中国人民解放军95655部队， 611500，成都
  3.西安交通大学机械工程学院， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202506004
  CLC： TK45
- Received：02 November 2024，
  
  Online First：25 February 2025，
  
  Published：10 June 2025
- 稿件说明：
移动端阅览
YANG Zhenghao, GENG Qi, JIA Guangyu, et al. Effects of Compression Ratio and Ignition Timing on the Overall Performance of Hydrogen-Fueled Elliptical Rotary Engine[J]. Journal of Xi’an Jiaotong University, 2025, 59(6): 32-41.
DOI：

YANG Zhenghao, GENG Qi, JIA Guangyu, et al. Effects of Compression Ratio and Ignition Timing on the Overall Performance of Hydrogen-Fueled Elliptical Rotary Engine[J]. Journal of Xi’an Jiaotong University, 2025, 59(6): 32-41. DOI： 10.7652/xjtuxb202506004.

摘要

为解决转子发动机狭长结构与偏心运动导致的燃烧性能差这一难题，提出了一种采用氢燃料的椭圆转子发动机，探索压缩比与点火正时对转子发动机动力学与热力学特性影响机制，提高发动机综合性能与能量转化效率。基于时序法建立椭圆转子发动机0维模型，将燃烧室系统内的热力学参数与物质组分视为均匀分布，依次建立层流火焰燃烧、漏气、传热、NO排放子模型；在此基础上，探究了压缩比（7、9、11）与点火正时（320°、330°、340°、350°）对稀燃条件下氢燃料椭圆转子发动机燃烧放热特性的影响。结果表明：提前点火会增加缸内高压持续期，增大工质泄漏；在低压缩比下，过晚的点火会使得缸内压力严重偏离等容燃烧曲线，降低发动机热功转换效率；压缩比为9的参考工况下，随着点火正时从320°升高至350°，峰值缸内压力下降了1.30 MPa，延后了13.86°；当压缩比升高至11时，发动机于较晚的340°点火可获得最高的指示功率12.67 kW与最低的指示油耗76.03 g/（kW·h），此时热效率达到0.338，较参考工况（压缩比为9、点火正时为330°）提高了1.65%。

Abstract

To address the problem of pror combustion performance caused by the narrow and long structure and eccentric motion of the rotary engine

a hydrogen-fueled elliptical rotary engine is proposed to explore the effect mechanisms of compression ratio and ignition timing on the dynamic and thermodynamic characteristics of the rotary engine

with the goal of improving overall engine performance and energy conversion efficiency. Therefore

a zero-dimensional model of the elliptical rotary engine is established based on the temporal method

treating the thermodynamic parameters and material components within the combustion chamber system as uniformly distributed. Sub-models for laminar flame combustion

air leakage

heat transfer

NO emission

and other factors are developed sequentially. Furthermore

the effects of compression ratios (7

11) and ignition timings (320°

330°

340°

350°) on the heat release characteristics of the hydrogen-fueled elliptical rotary engine under lean burn conditions are investigated. The results showed that advanced ignition increased the duration of high pressure within the cylinder and raised working fluid leakage. However

at low compression ratios

overly delayed ignition caused the cylinder pressure to deviate significantly from the constant-volume combustion curve

reducing the heat-work conversion efficiency of the engine. Under a reference condition with a compression ratio of 9

as the ignition timing increased from 320° to 350°

the peak in-cylinder pressure dropped by 1.30 MPa and was delayed by 13.86°. When the compression ratio was increased to 11

the engine could achieve the highest indicated power and the lowest indicated fuel consumption

12.67 kW and 76.03 g/(kW·h)

respectively

with the later ignition timing of 340°. In this case

the thermal efficiency reached 0.338

an improvement of 1.65% over the reference condition (compression ratio: 9

ignition timing: 330°).

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