摘要
采用标准k-ε模型及RNGk-ε模型验证了前人的试验结果,最大误差分别为2.5%,15.9%。对4道、7道环型直通式篦齿,在转静状态下采用非结构化网格和SIMPLE算法,求解了不同转速的速度场和压力场;并试验研究了不同转速、齿数工况的封严效果,探讨了篦齿前后压比与泄漏系数的变化关系。表明转速对篦齿封严的影响不明显,变化幅度在3.6%;低压比情况下,随着压比增大,在相同泰勒数变化范围内,泄漏系数略有增大。
The standard k-Ε turbulence model and RNG k-Ε turbulence model were employed to compute the flow characteristics of the labyrinth sealing in the given reference. Compared to their test data, the maximum errors were 2.5% and 15.9% respectively. The computations of annular straight-through sealing with four-tooth and seven-tooth at rotational and static states were carried out with the non-structure grid and SIMPLE method. The sealing effects for different number of tooth and rotational speeds were experimentally investigated. The relations between pressure ratio and leaking coefficient were also explored. The results show that the rotational speed plays a small role on sealing effectiveness, and makes a change of the leaking coefficient within 3.6%. Under low pressure ratio condition, the leaking coefficient goes up a little with the increase of pressure ratio with the same change of Taylor number.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2005年第3期444-449,共6页
Journal of Aerospace Power
关键词
航空、航天推进系统
旋转
篦齿
封严
湍流
Aerodynamics
Aircraft engines
Computer simulation
Experiments
Fluid dynamics
Rotation
Turbulence
