Abstract
In order to study the separation characteristics of the aeroengine dynamic pressure oil-air separator, this paper uses the coupling method of PBM and CFD two-fluid model to study the influencing factors such as cylinder diameter, cylinder length, and other factors on the separator performance. The flow field structure, velocity, gas volume distribution, separation efficiency, and gas and liquid holdup rate in the separator under different operating conditions are analyzed. Combined with the analysis results of the cylinder diameter and the cylinder length, the influence law of length-diameter ratio on separation efficiency is summarized. The optimum length-to-diameter ratio that maximizes the separation performance of the separator is obtained in this research, which provides a reference for the design and improvement of the separator. The results show that, as the diameter of the cylinder increases, the separation efficiency increases first and then decreases. When dsep = 16 mm and dsep = 18 mm, the separator reaches its maximum efficiency, which is about 93%. With the increase of the cylinder length, the separation efficiency first increases and reaches the maximum when l2 = 90 mm and then decreases slowly. When the separator cylinder is either too long or too short, it will cause the separation performance to decrease. There is an optimal aspect ratio. There is an optimal aspect ratio, and the separation performance of the separator is the best when the aspect ratio is between 5 and 6.
Highlights
In a high temperature, high pressure, and high-speed operating environment, the engine requires a high-performance lubrication system to ensure its safe and smooth operation
After years of hard work, great progress has been made in engine lubrication system research, but it is generally limited to the general theoretical description of the lubrication system or specific failure analysis, and the experimental research is usually limited to the overall performance testing of a certain part in the lubrication system. ere is a lack of research on heat exchange, friction, resistance components, and so on
Under the action of high-speed rotating parts, the lubricating oil is mixed with air to become lubricating oil emulsion, which is transported to the oil return system by the oil return pump, which will increase the pipeline resistance, reduce the performance of the oil-fueled radiator, and affect the lubrication conditions of the opposite surface, thereby seriously affecting the safety of the engine. erefore, an oil and gas separation device is required in the oil return subsystem
Summary
High pressure, and high-speed operating environment, the engine requires a high-performance lubrication system to ensure its safe and smooth operation. Wang et al [17] used RSM to simulate the cyclone field in the separator and obtained the pressure drop and velocity distribution rules of the flow field in the separator, and the simulation results were basically consistent with the experimental results On this basis, Zhu et al [18] studied the outlet forms at the bottom of the separator by using RSM, discussed the influence of different outlet forms on the flow field distribution, and believed that the single tangential outlet is more conducive to improving the separation efficiency. Based on the aeroengine lubricating oil system test bench, Zhang [26] used a dimensional analysis method to establish a mathematical model for predicting the separation efficiency and resistance of a dynamic pressure oil-air separator suitable for engineering. An optimal length-to-diameter ratio that optimizes the separation performance of the separator provides a reference for the design and improvement of the separator
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