- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LIU Jianshi, ZUO Zhaowei, LIU Weilong, ZHAO Jianhui. Simulation Research of Transient Cavitation Flow Characteristics of Diesel in High-Pressure Nozzles Considering Thermal Effects[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250379
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The fuel flow inside the high-pressure nozzle exhibits significant pressure drops and high flow velocities, leading to a high tendency towards gas-liquid two-phase flow with intense transient heat and a coupling between cavitation flow and thermal effect. Turbulence and cavitation models were corrected to incorporate thermal effects, and a non-isothermal compressible flow model for fuel within the nozzle was established. Simulation research of the transient cavitation flow of diesel in a high-pressure nozzle was conducted. Results show that 1) during the opening stage of the needle valve, cavitation develops rapidly, with its cavitation intensity influenced by the inlet pressure. At 180 MPa, the average cavitation volume fraction inside the orifice increases by approximately 24% compared to that at 60 MPa. Cavitation induces significant fluctuations in the fuel mass flow rate, thereby influencing injection stability. During the closing stage of the needle valve, the orifice is almost blocked by cavitation; the effective flow area is reduced, and the mass flow rate is significantly decreased. 2) The fuel temperature within the nozzle exhibits a non-uniform distribution. Fuel decompression, expansion, and endothermic phase transition reduce the local temperature and form a supercooled region. Temperature rise regions result from viscous friction of fuel caused by velocity gradients between the core orifice region and the near-wall region, with the maximum temperature reaching 410 K. 3) Fuel cavitation and temperature variations interact. Cavitation reduces fuel flow velocity, increasing velocity gradients between fluid layers and amplifying internal friction and kinetic energy losses of fuel, which elevates fuel temperature. The temperature rise subsequently increases saturated vapor pressure, further promoting cavitation development.
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