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在波瓣混合器几何结构不变的情况下,通过分别改变波瓣出口截面处中心锥半径以及波瓣长度建立了一系列几何模型,并采用数值模拟的方法,研究了中心锥关键结构参数对涡扇发动机波瓣混合排气系统气动热力性能的影响规律.结果表明:当中心锥长度不变时,随着波瓣出口处中心锥半径的增加,热混合效率先增加后减小,其中当波瓣出口处中心锥半径为0.55倍波瓣高度时,波瓣混合排气系统出口处热混合效率最大.此外,当中心锥长度不变时,波瓣混合排气系统总压恢复系数大体上不断减小;排气系统出口处推力系数则呈现出先增大后迅速减小.当波瓣出口处中心锥半径不变时,随着中心锥长度的增加,热混合效率和总压恢复系数变化极小,在排气系统出口处,推力系数则先迅速增大后略有降低.
A series of geometric models were established by changing the center cone radius and the lobe length at the exit of the lobe respectively under the condition that the geometry of the lobe mixer was constant. The numerical simulation was used to study the key structural parameters The results show that when the length of center cone is constant, the efficiency of thermal mixing first increases and then decreases with the increase of central cone radius at the exit of lobe, and when When the central cone radius of lobe exit is 0.55 times the lobe height, the efficiency of thermal mixing at the outlet of the lobe mixed exhaust system is the most. In addition, when the length of the center cone is constant, the total pressure recovery coefficient of lobe mixed exhaust system is roughly The coefficient of thrust at the exit of the exhaust system first increases and then decreases rapidly.When the central cone radius at the exit of the lobe is constant, with the increase of the length of the central cone, the change of the thermal mixing efficiency and the total pressure recovery coefficient Very small, at the exit of the exhaust system, the thrust coefficient first increases slightly and then decreases slightly.