Effect of different cooling mediums on mass injection pre-compression cooling. (5th June 2022)

• Record Type: Journal Article
• Authors: Lu, Yuming; Fei, Hongzi; Yang, Hao; Huang, Yiyong; Zhang, Hai
• Is Part Of: Applied thermal engineering. Volume 209(2022)
• Publication Date: 2022-06-05
• Subjects: Water injection -- Organic working mediums -- Cooling -- Spray -- Nozzle; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2022.118216
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Related experiments are conducted to explore the cooling effect of mixed organic working mediums, including concentration, liquid–gas ratio, incoming airflow temperature, etc. This part of the research is relatively rare in previous studies. In the test, a gas analyzer is applied to record and analyze the evaporation rate of ethanol in the test to explore the evaporation characteristic of the organic coolant. The simulation results are calibrated through the test data to verify the accuracy of the simulation and confirm the accuracy and reliability of the test method. Abstract: In the process of injection cooling, the selection of working mediums brings different effects. However, most researches still focus on water. Compared with water, the vapor formed by the evaporation of organic cooling mediums such as ethanol can assist combustion in the combustion chamber. The current research on the cooling effect of organic mediums is relatively lacking. Therefore, related tests on the cooling effect of organic working fluids are conducted. The test results show that: as the spray temperature decreases from 45 ℃ to 18 ℃, the cooling effect improves (maximum temperature drop reaches 63 ℃). Ethanol solutions of various concentrations can maintain an evaporation rate of more than 75%, and its evaporation and cooling effect are improved with the concentration increase. Not all organic cooling mediums can bring good temperature drop and evaporation effects, including glycol solution. In working conditions, a higher airflow temperature (up to 150 °C) can enhance the cooling effect of the working mediums, and the liquid–gas ratio (6.62–10.76%) has almost no influence on the temperature drop. Finally, the simulation results are calibrated through the test data to verify the accuracy of the simulation and confirm the accuracy and reliability of the test method.