摘要
为了更大限度地挖掘预旋系统的温降潜力,对有盖板的预旋进气转-静盘腔内的气动热力问题进行了数值模拟,研究了旋转雷诺数、无量纲流量和旋转比对系统温降和压力损失特性的影响,结合盘腔内的流动特征分析了预旋温降和压力损失机理.计算表明绝热条件下的预旋温降主要受动静坐标系转换引起的动降温、离心升温,以及摩阻做功与黏性耗散等不可逆因素三方面影响,其中动降温取决于气流速度和相对速度,这些因素综合决定了系统温降随旋转雷诺数、无量纲流量和旋转比的变化规律.系统压降主要受气动损失、离心升压和坐标系转换引起的动压变化三方面影响.数据显示旋转比是无量纲温降和压力损失系数的主要影响因素.还讨论了预旋孔和接受孔流量系数随流量、转速和旋转比的变化规律.
To dig out the potential temperature drop of a preswirl system,numerical simulations were carried out for the aero-thermodynamics in a cover-plate preswirl rotor-stator cavity.The influences of rotational Reynolds number,non-dimensional mass flow rate and swirl ratio on the system temperature drop and pressure loss were studied,and the corresponding mechanisms were analyzed together with the flow structure in the cavity.Data show that the temperature drop in adiabatic preswirl system is dominated by three aspects：dynamic temperature drop in course of coordinate system transformation,centrifugal temperature increase,and irreversible factors like friction work and viscosity dissipation.Of which,dynamic temperature drop is determined by velocity and relative velocity.These aspects dominate the variation law of temperature drop with rotational Reynolds number,non-dimensional mass flow rate,and swirl ratio.The pressure drop is mainly caused by：aerodynamics loss,centrifugal pressure increase,and variation of dynamic pressure in course of coordinate system transformation.The results show that swirl ratio is the main influential factor to non-dimensional temperature drop and pressure loss coefficient.The influences of mass flow rate,rotating speed,and swirl ratio on the discharge coefficient of nozzle and receiver hole were also discussed.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2010年第11期2498-2506,共9页
Journal of Aerospace Power
关键词
预旋
盖板
转-静盘腔
温降
压力损失
流量系数
preswirl； cover-plate； rotor-stator cavity； temperature drop； pressure loss； discharge coefficient；
