Design Of Gas-liquid Seperator Device And The Performance Research

Gas-liquid separation flow is one of the two-phase flow pattern.When the engine oil passes through the components to be cooled or lubricated,it is mixed with the air and is formed a mixture which will cause the oil pressure in the pipe to drop and reduce the cooling and lubricating ability.Therefore,how to efficiently separate gas-liquid two phases has become an important research topic in the fields of aviation.At present,there is a lack of research on the structural parameters of the separator,the analysis of its internal flow field and separation efficiency for different inlet flow conditions.In this paper,the structure of cyclone separator is used to preliminarily design the gas-liquid separator and take it as a reference.Optimize the design of the reference separator to complete the design of the dynamic pressure separator under high gas content conditions and axial flow separator under low gas content conditions suitable for different inlet flow rates and operating pressures.The main optimization contents of the design are: Establishing the optimal design logic with the cylinder diameter as the core structure parameter and the air rate as the core inlet parameter.Optimize the empirical formula for the cyclone separator to calculate the optimal diameter of the separator.Using the bubble and droplet in the rotating flow field trajectory model to calculate the optimal separation length etc.Use the separator design in this paper to establish the modeling of gas-liquid separator.Under certain inlet conditions,the two-phase flow of gas phase and liquid phase in the separator were simulated separately.The results show that: The tangential velocity field conforms to the Rankine vortex characteristic model.Due to the presence of a back pressure gradient,the gas phase is squeezed to the axis and flow from bottom to top.As for the internal and external swirling interfaces,the radius is independent of the separator inlet structure.The turbulence intensity at the near wall surface of the separation section is relatively large.For the gas-liquid two-phase flow simulation,the discrete phase model is used,and the two separators respectively add bubbles and droplet particles to simulate the separation motion and the flow field distribution.The calculation results show that the separation efficiency of the dynamic pressure type and axial flow separator designed in this paper is more than 85%,and the minimum separation particle diameter is about 20?m.The axial flow gas-liquid separator has a more stable rotating flow field.Compared with the reference separator,under the same inlet parameters,the separation efficiency of the dynamic pressure gas-liquid separator in this paper is 89.86%,which is 27.46% higher than the former.The dynamic pressure type and axial flow separator designed in this paper have good separation ability for different inlet flow and operating pressure.To some extent,this research solved the problem of low separation efficiency of the gas-liquid separator due to the mismatch of the inlet conditions.