Calculating Piston Ring Leakage at 400bar Pressure

In summary, the conversation discusses the difficulty of calculating piston ring leakage in a hydraulic system with high operating pressures. The speaker mentions that most available information is geared towards IC engines and that there are differences in piston configuration. They also ask for advice on determining pressure distribution against the cylinder wall and the possibility of relating fluid mechanics at high pressures where leakage occurs at high velocities. The person recommends a book by George R. Keller for hydraulic system analysis, which contains useful formulas and graphs. The conversation also mentions the importance of seal dimensions and suggests checking Parker Hydraulics for more information.
  • #1
g0ggs123
22
0
Does anyone have experience of calculating piston ring leakage, my problem is that the piston leakage is in a hydraulic system with a flooded cylinder and operating pressures of up to 400bar. All journals I find are on IC engines and so the theory is very different.

There are also differences in piston config, the piston I am looking at has one ring whereas a IC engine piston has numerous piston rings designed to do different things.

So, anyone know how to work out the pressure distribution against the cylinder wall and also if it is possible to relate fluid mechanics at such high pressure where leakage is at fairly high velocity, basically the fluid is getting blasted through the split line in the ring.

Cheers
Gordon
 
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  • #2
Hydraulic System Analysis by George R. Keller, P.E. published by H&P has some information. It contains some formulas but without the background information they are not much use. It covers about 3 pages with graphs etc so it is too much to type. You may be able to borrow a copy from a library or if you want to buy a copy it’s available in their bookstore at:
http://www.hydraulicspneumatics.com/default.aspx

The book does not give dimensions for seal lands. Maybe Parker Hydraulics has a design handbook for these seals because they have a lot of information available. Like ICE’s the pressure helps to seal the fluid.
 

1. How is piston ring leakage calculated at 400bar pressure?

The piston ring leakage at 400bar pressure is calculated by measuring the volume of gas that escapes through the piston rings during a compression stroke. This can be done using specialized equipment such as a leakage tester.

2. What is the significance of calculating piston ring leakage at 400bar pressure?

Calculating piston ring leakage at 400bar pressure is important for evaluating the efficiency of an engine's combustion process. It can also indicate potential issues with the piston rings, such as wear and tear, that may affect engine performance and emissions.

3. How is the leakage rate of piston rings determined?

The leakage rate of piston rings is determined by dividing the volume of gas that escapes through the rings by the total volume of gas compressed by the piston during a single stroke. This gives a percentage that represents the efficiency of the piston rings.

4. What factors can affect piston ring leakage at 400bar pressure?

Several factors can affect piston ring leakage at 400bar pressure, including the quality and condition of the piston rings, the type of fuel used, and the engine's operating conditions such as temperature and load. Any issues with these factors can result in increased piston ring leakage.

5. How can piston ring leakage at 400bar pressure be reduced?

Piston ring leakage at 400bar pressure can be reduced by ensuring the piston rings are in good condition and properly installed, using high-quality fuel, and maintaining proper engine operating conditions. Regular maintenance and inspection can also help identify and address any issues that may contribute to increased piston ring leakage.

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