Haruo Yoshiki

Visualization of Unsteady Flow Induced by Circular Cascade

The purpose of this investigation is to visualize the unsteady flow induced by variable inlet guide vane (VIGV) of a small turbine for automobiles. Instantaneous flow fields of the VIGV are visualized with PIV and phase averaging method. Experimental conditions of the flow around the VIGV depend on the existence of air bubbles. In order to remove these air bubbles, stabilizing core is installed at the center of the VIGV. Rotating cells of high velocity are moving from the pressure side to the suction side, which is synchronized with pressure fluctuation. A region with strong vorticity is also moving. When the leading and trailing vorticity is increasing, throat velocity of VIGV is increasing.

Loss and outlet flow angle estimation in rectangular scrolls for radial turbines by a constructed flow model

The flow model and loss model in the rectangular scrolls constructed from the main flow with free vortex flow, the 3D equilibrium boundary layer on the side walls and the 2D boundary layer on the inner and outer walls, and the equation to estimate the loss in it were made in this research. The model is based on the theory of the 3D equilibrium boundary layer. The calculated results of it are shown good coincidence with test results. The flow equations are made from the 3D boundary layer equation with 1/n multiplier law and Magers equation, and main flow with free vortex flow. Those equations have three unknown variables which are n, boundary layer thickness and radial velocity parameter. The mean outlet flow angles are estimated by using the values of those three variables decided by the measured volocity distributions. It is made clear that the flow rate of main flow is reduced by the flow through the 3D equilibrium boundary layer and the outlet flow angle become small at the main flow, and the loss less main flow is sustained for being main flow.