张宇,王晓亮,马影.平流层飞艇对转螺旋桨推进性能研究[J].,2020,60(3):221-227 |
平流层飞艇对转螺旋桨推进性能研究 |
Study of propulsion performance of contra-rotating propellers for stratospheric airship |
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DOI:10.7511/dllgxb202003001 |
中文关键词: 平流层飞艇 对转螺旋桨 混合网格 多重参考系 计算流体力学 |
英文关键词: stratospheric airship contra-rotating propellers hybrid grid multi-reference frame computational fluid dynamic |
基金项目:国家自然科学基金资助项目(61733017);上海市自然科学基金资助项目(18ZR1419000). |
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中文摘要: |
为研究平流层飞艇对转螺旋桨安装参数对推进性能的影响,探寻其效率提升的内因, 使用混合网格技术进行计算域离散,采用基于RANS方程和SST湍流模型的求解器,建立了多重参考系模型,通过与由片条理论和遗传算法优化所得结果对比,验证了数值方法的准确性.对以ClarkY翼型设计的对转螺旋桨推进性能进行了研究,分析了在不同前进比J和不同螺旋桨间距L情况下,对转螺旋桨推力系数、扭矩系数和效率的变化.结果表明,在产生相同推力的情况下,对转螺旋桨效率较单桨提高13.3%,综合扭矩仅为单桨的4.8%;随着L的增大,推力系数和扭矩系数均有所上升,当J=0.5时,效率最高;绝大多数情况 下,综合扭矩低于9 N·m,对转螺旋桨前、后桨的推力比期望值为1.29. |
英文摘要: |
In order to study the influence of the installation parameters of the stratospheric airship contra-rotating propellers (CRP) on the propulsion performance and explore the internal factors of its efficiency improvement, the hybrid grid technique is used to discretize the computational domain, and the multi-reference frame model is established with using the solver based on Reynolds averaged Navier-Stokes (RANS) equations and SST turbulence model. The accuracy of the numerical method is verified by comparison with results obtained by strip theory and genetic algorithm. The propulsion performance of CRP designed with Clark Y airfoil is studied. The variation of thrust coefficient, torque coefficient and efficiency of the propellers is analyzed under different forward ratios Jand different propeller spacing L. The results show, in the case of the same thrust, the efficiency of CRP is 13.3% higher than that of the single propeller, and the resultant torque is only 4.8% of the single propeller; as L increases, the thrust and torque coefficients both rise, when Jequals 0.5, the efficiency is the highest; in most cases, the resultant torque is less than 9 N·m, and the average thrust ratio of the front and rear propellers is 1.29. |
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