Slurry pump inviscid flow solution
Slurry inviscid flow technology include the following: (a) two-dimensional cascade flow theory; (2) two-dimensional and three-dimensional potential flow solution; (3) two-dimensional quasi-three-dimensional, stream function equations; (4) two dimensional and three-dimensional Euler equations; (5) secondary flow theory.
Slurry-dimensional cascade theory is a relatively simple method, which are most effective in pressure and economic forecasting. Further estimate the flow field slightly less. Therefore, since Professor Wu Zhonghua proposed to give the two opposite faces of the general theory of flow ，the quasi-three-dimensional flow calculations made a lot of eye-catching results. At present, the industrial sector has been widely used. Katsanits and Meokally, Krimmerman and Adler have developed this technology. Domestic Xin Xiao Kang Jiang Jinliang made any Dingzhun orthogonal surface method, Wu Yulin, etc. using this method to calculate the mixed slurry pump hydraulic machinery.
In the 1980s, non-sticky computing mainstream turned Euler equations, which is due to three-dimensional potential flow and other methods can not consider the whirlpool effect which can be given to all viscous losses suffered losses values.
In recent years, three-dimensional non-sticky gravel slurry pump computing matures, more and more people are turning to work mainly include boundary layer viscous flow calculation method, Navier-Stokes equations sectional chemical method and Navier-Stokes equations.
Commonly used methods of solving boundary are integral method and finite difference method points. Since the development of computer technology, the later gradually replaced the former. Arakawa et axial pump with integral method for solving the three-dimensional turbulent boundary layer on the blade; Lakshminarayana integration method such as using a turbine blade and impeller opium dimensional edge class mobility, the coefficient of friction between the surface through the introduction of the modified method takes into account into the rotation, curvature and pressure gradient effect yet. Vasta export of non-orthogonal rotation coordinates corresponding boundary layer equations and solution method; Anderson has conducted some improvements, using the measured pressure and the surface of the Euler equations,Operation steps of slurry pump draw the boundary layer outer boundary conditions, and then calculate the rotation cascade the flow of the pressure surface. The result of the finite difference method is combined with the experiment, Wu Yulin, calculate the water conservancy machinery at off-design conditions, predict the local separation of the impeller leading and trailing edge.
Gravel pump solid-liquid mixture flows into the short tube from the suction impeller, the solid particles into the radial and axial movement to the rear cover, due to inertia acting on the rear cover collided with the rear cover to withstand the effect of larger particles force, increased wear and tear. Most of the solid particles near the blade from the blade leading face of the blade into the flow channel, and a part of the blade near the back of the particles into the flow path. Morphology from the impeller wear and abrasion results, from the leading edge of the back edge of the blade wears extensions. Pumping a mixture of fine particles, the flow channel of the blade and the blade-type moving trajectory of curvature similar to the blade face of the wear suffered serious than the blades back.
Gravel pump solid particles coming out from the blade, where in the fine particles smaller exit angle along the trajectory of movement. Adjacent to the outer periphery of the impeller mixture flow area, API standard mean the fine particles have a small radial velocity. Mixture slowly discharged from the impeller and the inner peripheral wall of the flow of the pump, solid particles gradually increased, the impeller blade outlet edge withstand chilly mixture role blade outlet edge of the blade wear the worst parts.
Post time: Jul-13-2021