TS-37 Unsteady Phenomena Associated with the Shock Wave Occurring near the Stall Line in Two-Dimensional Supersonic Cascade(Session B-4: Unsteady Flow 1)

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概要

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• Two-dimensional unsteady flows which have a supersonic inlet with a subsonic axial component relative to the cascade were calculated numerically. The ARL-SL19 cascade (Tweedt et al., 1988) data was used for the cascade geometry. Calculations are made assuming a periodicity over 10 blades for the two cases of the blade Mach number, v_1/c_<01abs>=1.3 and 1.5 to examine the shock related instabilities predicted by our linear stability analysis based on an actuator disk method (Iwamoto et al., 1998). For v_1/c_<01abs>=1.5, it was found that the flow fluctuation propagates in the direction opposite to the cascade rotation with a relative velocity 19% of the rotor speed near the stall line. This fluctuation is caused by the moving higher Mach number region in the upstream which is emanating from the suction side near the leading edge. For v_1/c_<01abs>=1.3, no propagating fluctuations were observed near the stall line. However, when the back pressure is 2% less than the near-stall point, it was found that the flow fluctuation propagates in the same direction as the cascade rotation with a relative velocity 119% of the rotor speed. This type of fluctuation was not observed in the case of v_1/c_<01abs>=1.5, and is driven by the interaction between the higher pressure in the cascade discharge area and the passage shock. In the last section, the comparison of propagating velocities of the numerical result and of our previous linear analysis is presented. The propagating velocity of the forward travelling fluctuation in the numerical result agrees well with the linear analysis solution which is considered to be an instability associated with a shock.

• 社団法人日本ガスタービン学会の論文
• 1999-11-14

著者

• YOKOTA Kazuhiko

  Graduate School of Engineering Science, Osaka University

• TSUJIMOTO Yoshinobu

  Graduate School of Engineering Science, Osaka University

• Yokota K

  Osaka Univ. Toyonaka Jpn

• Yokota Kazuhiko

  Graduate School Of Engineering Science Osaka University

• IWAMOTO Yukiharu

  Graduate School of Engineering Science, Osaka University

• Tsujimoto Y

  Osaka Univ. Osaka Jpn

• Tsujimoto Yoshinobu

  Graduate School Of Engineering Science Osaka University

• Iwamoto Yukiharu

  Graduate School Of Engineering Science Osaka University

• Tsujimoto Yoshinobu

  Graduate School Of Engineering Science Division Of Mechanical Science Osaka University

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