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Experimental and numerical analysis of the effect of swirl on the pressure field in whirling annular and labyrinth seals.

機(jī)譯：旋流對環(huán)形和迷宮式密封中壓力場影響的實驗和數(shù)值分析。

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In order to physically explain how the combined effect of turbulence and curvature affect the flow field in an annular and labyrinth seal, the present work presents measurements of the dynamic and mean pressure distributions on the stator wall of whirling annular and labyrinth seals for three different pre-swirl conditions: --45, 0 and +45 degrees. A calculation of the forces and moments generated by the pressure field has been performed and an analysis of the effect of swirl on the pressure field developed. In addition, because of the complex three dimensional nature of the flow and curvature which is not in the streamline direction, any prediction of the flow should be based on experimental boundary conditions to seek a convergence of the equations with better agreement with reality. Such predictive ability would greatly aid in the design of labyrinth and annular seals which are critical turbomachinery components. By providing these dynamic and mean pressure boundary conditions and utilizing the flow field velocity measured by Morrison et al. (1990, 1994), it is hoped that the following work will be a step toward improving simulation and therefore reduce testing and development cost. To illustrate the use of these data, computer simulations of centered and 50% eccentric annular and labyrinth seals for the different preswirls were performed using a CFD code, FLUENT UNS. These computer simulations of pressure and velocity data were compared to the pressure and LDV measurements.
機(jī)譯：為了從物理上解釋湍流和曲率的綜合作用如何影響環(huán)形和迷宮式密封件中的流場，本工作介紹了三種不同的預(yù)旋轉(zhuǎn)渦流式環(huán)形和迷宮式密封件的定子壁上動壓和平均壓力分布的測量值-渦流條件：-45度，0度和+45度。已經(jīng)對壓力場產(chǎn)生的力和力矩進(jìn)行了計算，并對渦旋對壓力場的影響進(jìn)行了分析。另外，由于流動和曲率的復(fù)雜的三維性質(zhì)（不在流線方向上），任何對流動的預(yù)測都應(yīng)基于實驗邊界條件，以尋求方程的收斂性，使其與實際情況更好地吻合。這種預(yù)測能力將極大地幫助設(shè)計迷宮式和環(huán)形密封件，而迷宮式密封件和環(huán)形密封件是關(guān)鍵的渦輪機(jī)械部件。通過提供這些動態(tài)和平均壓力邊界條件，并利用Morrison等人測量的流場速度。 （1990，1994），希望接下來的工作將朝著改善仿真邁進(jìn)，從而降低測試和開發(fā)成本。為了說明這些數(shù)據(jù)的使用，使用CFD代碼FLUENT UNS對不同預(yù)旋的居中和50％偏心環(huán)形和迷宮式密封進(jìn)行了計算機(jī)模擬。將這些壓力和速度數(shù)據(jù)的計算機(jī)模擬與壓力和LDV測量值進(jìn)行了比較。

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