Effect of Water Injection Temperature on Characteristics of Combustion and Emissions for Internal Combustion Rankine Cycle Engine

2014 ◽  
Author(s):  
Le-zhong Fu ◽  
Zhijun Wu ◽  
Liguang Li ◽  
Xiao Yu
Keyword(s):  
Water Injection ◽  
Rankine Cycle ◽  
Internal Combustion ◽  
Effect Of Water ◽  
Injection Temperature

scholarly journals Chemical kinetic analysis of in-cylinder ion current generation under direct water injection within internal combustion Rankine cycle engine

2021 ◽  
pp. 161-161
Author(s):  
Zhe Kang ◽  
Yang Lv ◽  
Nanxi Zhou ◽  
Lezhong Fu ◽  
Jun Deng ◽  
...  
Keyword(s):  
Initial Temperature ◽  
Water Injection ◽  
Rankine Cycle ◽  
Internal Combustion ◽  
Chemical Kinetic ◽  
Ion Current ◽  
Residual Water ◽  
Current Signal ◽  
Injection Process ◽  
Direct Water Injection

Direct water injection provides feasible solution for combustion optimization and efficiency enhancement within internal combustion Rankine cycle engine, while the feedback signal of close-loop direct water injection control is still absent. Ion current detection monitors in-cylinder electron variation which shows potential in revealing direct water injection process. For better understanding of unprecedented augment of ion current signal under direct water injection within internal combustion Rankine cycle engine, a chemical kinetic model is established to calculate the effect of intake oxygen fraction, fuel quantity, initial temperature and residual water vapor on in-cylinder electron formation based on GRI Mech 3.0 and ion current skeleton mechanism. The simulation results indicate direct water injection process show significant impact on in-cylinder electron formation through chemical interactions between H2O and other intermedia species including HO2, O2, CH3 and H, these reactions provides additional OH radical for propane oxidation facilitation, which result in large portion of CH radical formation and therefore, lead to higher in-cylinder electron generation. The initial temperature plays a vital role in determining whether residual water vapor show positive or negative effect by in-cylinder temperature coordination of direct water injection. Results of this work can be used to explain phenomenon related to direct water injection and ion current signal variation under both internal combustion Rankine cycle or traditional petrol engine.

Experimental Study of Ion Current Signals and Characteristics in an Internal Combustion Rankine Cycle Engine Based on Water Injection

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Zhe Kang ◽  
Zhijun Wu ◽  
Lezhong Fu ◽  
Jun Deng ◽  
Zongjie Hu ◽  
...  
Keyword(s):  
Water Vapor ◽  
Water Injection ◽  
Rankine Cycle ◽  
Internal Combustion ◽  
Operating Conditions ◽  
Ion Current ◽  
Pure Oxygen ◽  
Current Signal ◽  
Injection Process ◽  
Current Detection

The internal combustion Rankine cycle (ICRC) engine utilizes pure oxygen as the oxidant instead of air during combustion to prevent the generation of nitrogen oxide emissions and lower the cost of CO2 recovery. To control combustion intensity and increase efficiency, water injection technology is implemented as it can increase the in-cylinder working fluid during combustion process. To further enhance the system thermal efficiency, the injected water is heated using coolant and waste heat before being directly injected into combustion chamber. The main challenge of controlling the ICRC engine is the interaction between water injection process and combustion stability. Ion current detection provides a potential solution of real-time detection of in-cylinder combustion status and water injection process simultaneously. In this paper, the characteristics of ion current signal in an ICRC engine were studied. The results indicate the ion current signal is primarily affected by the combination of trapped water vapor injected in the last cycle and in-cylinder combustion intensity. The water vapor contributes to the ionization reactions, which lead to enhanced ion current signals under water cycle. The ion current signal is capable of reflecting the operating conditions of the in-cylinder water injector. The phase of the ion current peak value has a linear relation as the water injection timing is delayed, and ion current detection technology has the potential to detect the combustion phase under different engine loads in an internal combustion Rankine cycle engine.

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