【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20191211
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Question: What are the reasons why the tip leakage loss in reaction stages is greater than that in impulse stages? There are no answers provided for this series of posts; fellow netizens are free to share their own opinions – just reply with what you understand. Replies earn rewards ranging from 5 to 15 points; all forum members are welcome to participate actively and support the development of the forum! ! ! Chemical Equipment and Machinery
The reason why the steam leakage loss in the reaction stage is greater than that in the impulse stage is that the steam leakage amount through the inner-diameter steam seal in the reaction stage is higher than that through the partition steam seal in the impulse stage; this is mainly because the diameter of the inner-diameter steam seal is larger than that of the partition steam seal, and the number of seal teeth is relatively fewer； The pressure difference before and after the reactive stage blades is large, resulting in a considerable amount of steam leakage at the blade tips.
The steam leakage at the root of the stator ring (or diaphragm) and at the top of the rotor blades does not contribute to work generation within the stage, thereby reducing the stage efficiency. There are also leakage losses at the root of the moving blade. Due to the high reaction degree of the reaction stage and the large inner diameter of the stator ring, the leakage losses at the top of the rotor blades and at the root of the stator ring are greater than those in the impulse stage
The reason why the steam leakage loss in the reaction stage is greater than that in the impulse stage is that the steam leakage amount through the inner-diameter steam seal in the reaction stage is higher than that through the partition steam seal in the impulse stage; this is mainly because the diameter of the inner-diameter steam seal is larger than that of the partition steam seal, and the number of seal teeth is relatively fewer； The pressure difference before and after the reactive stage blades is large, resulting in a considerable amount of steam leakage at the blade tips.
1. The air leakage rate through the internal diameter gas seal in the reaction stage is greater than that through the partition in the impulse stage, and the number of teeth in the gas seal is relatively small. 2. The pressure difference before and after the moving blades is large, so the air leakage at the blade tips is considerable
1) The steam leakage rate of the inner-diameter steam seal is greater than that of the diaphragm stage steam seal, mainly because the diameter of the inner-diameter steam seal is larger than that of the diaphragm steam seal, and the number of seal teeth is relatively small. 2) The pressure difference before and after the moving blade is large, so the steam leakage at the blade tip is considerable.
1) The steam leakage rate of the inner-diameter steam seal is greater than that of the diaphragm stage steam seal, mainly because the diameter of the inner-diameter steam seal is larger than that of the diaphragm steam seal, and the number of seal teeth is relatively small. 2) The pressure difference before and after the moving blade is large, so the steam leakage at the blade tip is considerable.