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考虑封严容腔的涡轮非轴对称端壁优化目标研究 预览

Non-Axisymmetric Endwall Optimization Objective Research in Turbine Including the Rim Sealing Flow
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摘要 基于自主开发的非轴对称端壁优化设计平台,在某高负荷低压涡轮环形叶栅上开展了非轴对称端壁设计,分别以总压损失、SKEH以及两者的组合参数为优化目标对不同的目标函数进行研究,计算时考虑下端壁封严容腔的影响。研究结果表明,封严容腔对端区二次流发展有重要影响,端壁造型能优化封严冷气出流方向和出流特征,从而抑制通道涡发展,因此在非轴对称端壁设计时要考虑容腔效应;单独采用SKEH为优化目标时,优化集中在降低二次动能上,遏制了封严出流漩涡的形成,不能有效抑制马蹄涡压力面分支的生成和发展。 Based on the self-developed non-axisymmetrical endwall optimization design platform, a non-axisymmetric endwall design was carried out on a high-load low-pressure turbine annular cascade, and the total pressure loss, SKEH, and the combination of the two parameters were optimized for different targets. The objective function was studied and the influence of the lower wall seal chamber was considered when calculating. The results of the research show that the sealing volume has an important influence on the secondary flow development in the end zone. The end wall shape can optimize the outflow direction and outflow characteristics of sealed cold air, thus inhibiting the development of the channel vortex. Therefore, the non-axisymmetric end wall design should take into account the cavity effect. When SKEH alone is used as the optimization goal, the optimization focuses on the reduction of the secondary kinetic energy, which inhibits the formation of the outflow eddies of sealing, and can not effectively inhibit the generation and development of the branch of the pressure surface of horseshoe vortex.
作者 潘贤德 吕剑波 PAN X iande,LV Jianbo (AECC Commercial Aircraft Engine Co., Ltd., Shanghai 200241)
出处 《现代制造技术与装备》 2018年第4期51-55,共5页 Modern Manufacturing Technology and Equipment
关键词 涡轮 非轴对称 端壁 容腔 设计方法 turbine non-axisymmetric endwall cavity design method
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