Investigation of Homogeneous Relaxation Model Parameters and their Implications for Gasoline Injectors [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 629.1175 Aerospace engineering
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Office of the Assistant Secretary of Energy Efficiency and Renewable Energy ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2017
• Mô tả vật lý: Size: p. 345-365 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 266662
• Chủ đề: 1. 33 advanced propulsion systems; 2. Cavitation; 3. Degree of superheat; 4. Flash boiling; 5. Gasoline direct injection

Tóm tắt

Flash boiling is known to be a common phenomenon for gasoline direct injection (GDI) engine sprays. The Homogeneous Relaxation Model has been adopted in many recent numerical studies for predicting cavitation and flash boiling. The Homogeneous Relaxation Model is assessed in this study. Sensitivity analysis of the model parameters has been documented to infer the driving factors for the flash-boiling predictions. The model parameters have been varied over a range and the differences in predictions of the extent of flashing have been studied. Apart from flashing in the near nozzle regions, mild cavitation is also predicted inside the gasoline injectors. The variation in the predicted time scales through the model parameters for predicting these two different thermodynamic phenomena (cavitation, flash) have been elaborated in this study. Turbulence model effects have also been investigated by comparing predictions from the standard and Re-Normalization Group (RNG) k-? turbulence models.