Orthogonal experiment of effect of fin geometrical parameters on leakage of straight-through labyrinth seals

An orthogonal experiment was made to study the influence of the geometry parameters of straight-through labyrinth seals on sealing characteristics.The geometry parameters studied include the fin tip thickness,seal clearance,fin height,fin pitch,fin front inclined angle and rear inclined angle.The experiment was made with 25 models that were designed according to the orthogonal test method.The results show that various parameters have different influences on discharge coefficient.The best combination of various geometry parameters for sealing in the test range is that fin tip thickness takes 0.1mm,seal clearance takes 0.3mm,fin height takes 3 mm,fin pitch takes 9 mm,fin front inclined angle takes 0 degree and rear inclined angle takes 15 degree .The rank of importance of each parameter's variation from its maximum to minimum value on sealing characteristics is fin pitch,seal clearance,rear inclined angle,fin tip thickness,fin height,fin front inclined angle.Fin pitch is the most important parameter,seal dearance is less important than fin pitch,rear inclined angle and fin tip thickness have certain impact on the sealing characteristics,while fin height and fin front inclined angle have little influence on it.