The accumulation of catalyst dust at the honeycomb seal for a long time will lead to the honeycomb seal cell blockage, weaken the seal effect of the honeycomb seal, and directly affect the safe and stable operation of the flue gas turbine. Therefore, a research on the influence of honeycomb cell blockage on the seal leakage characteristics is carried out. The flow field model of honeycomb seal is established, and the influence of cell blockage on the leakage characteristics of honeycomb seal is analyzed. A seal leakage characteristic experiment bench is built, and the numerical simulation results are verified by the experiment bench. Compared with the honeycomb seal without blockage, the leakage of the honeycomb seal with a blockage rate of 25% increases by about 6.5%, while the leakage of the honeycomb seal with a blockage rate of 25% obtained by the experiment increases by about 6.3%. The numerical simulation results are in good agreement with the experimental results. The results of this research provide theoretical support for revealing the seal leakage characteristics of honeycomb seals under blockage faults.
In order to reduce the leakage and the temperature of the end face of the piston ring to prolong its service life, an experimental research of the piston ring with different types of end face structures is carried out. In this research, a high-pressure and high-speed rotary seal experiment bench is built, and the leakage and temperature experiment of piston rings such as traditional type, micro-pit type, circular arc groove type and V-groove type are carried out. The results show that when the pressure is 1–2 MPa and the speed is 1000–5000 rpm, the V-groove type piston ring has the best comprehensive performance among the four different structures of the piston rings, which can not only reduce the temperature of the piston ring to prolong the service life of the piston ring, but also reduce the leakage of the piston ring. The results of this research reveal the influence of different types of end face structures on the leakage and temperature of the piston ring, which can provide theoretical support for its optimal design.
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