Numerical study of hydrofoil surface jet flow on cavitation suppression
WANG Wei, LU Shengpeng, XU Ruiduo, YI Qi, WANG Yayun, WANG Xiaofang
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China
摘要 Cavitation caused vibration and noise of hydraulic machinery. To some extent, cavitation made fatigue damage in advance. Many scholars found that the reentrant jets were the reason of the shedding of cavities. To suppress cavitation, based on the idea of blocking the reentrant jets, a special surface flow structure of 2D hydrofoil was proposed. The throughhole was made in the proper position of the hydrofoil. The incoming flow can outflow from this jethole automatically depending on the pressure difference between pressure side and suction side. Reentrant jet growth can be weakened by optimizing the jethole geometry. Based on the standard k-ε turbulence model and Schnerr ＆ Sauer cavitation model, under different cavitation numbers (σ) and jetangles (β) for NACA0066 (2D) hydrofoil with 8° angles of attack, cavitation field numerical analysis was carried out. The results showed that 2D hydrofoil cavitation flow had a strong unsteadiness. Making a jethole at the junction between the reentrant jet and cavity can effectively minimize cloud cavitation. For a certain cavitation condition, optimal jetangles (β) can be obtained to control cavitation growth. For the same β, the effects of cavitation suppression were changed with different cavitation numbers (σ). Consequently, suitable jetangle and jetposition could extend the stable operating range of the hydrofoil, which were of great significance for the hydrofoil design.
通讯作者:
WANG Wei(1967—),female, associate professor, master tutor (wangw@dlut.edu.cn), researching in turbomachinery.
作者简介: WANG Xiaofang(1960—),female, professor, doctoral supervisor (corresponding author, dlwxf@dlut.edu.cn),researching in turbomachinery.
引用本文:
WANG Wei, LU Shengpeng, XU Ruiduo, YI Qi, WANG Yayun, WANG Xiaofang. Numerical study of hydrofoil surface jet flow on cavitation suppression[J]. 排灌机械工程学报, 2017, 35(10): 829-834.
