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ball piston machines

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ball piston machines

Postby arpthahs » Thu Feb 16, 2012 2:44 pm

can you plz send me the full report and ppt of the above topic as i need it for my seminar......
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Joined: Thu Feb 16, 2012 2:37 pm

Re: ball piston machines

Postby Prasanth » Thu Feb 16, 2012 7:18 pm

A new power machine concept has been designed and analyzed for production, and proof of principle subscale tests have been performed, with positive results. The machine design concept is applicable as a compressor, pump, motor, or engine. Simplicity of design based on spherical ball pistons enables a low moving part count, high power to weight ratio, elimination of valve train and water cooling systems, and perfect dynamic balance.

The new design concept utilizes novel kinematic design to completely eliminate inertial loads that would contribute to sliding friction. Also, low leakage is maintained without piston rings by using a small clearance on the ball piston, resulting in choked flow past the ball. These features provide the potential for an engine with higher efficiency than conventional piston engines. The engine design utilizes existing recent technology to advantage, such as silicon nitride ball pistons, so a large development effort is not required.

The machine having only a small number of moving parts, the design implements a modified version of the tried and proven thermodynamic Otto cycle when used as an engine. Although the small part count is an important advantage, other advantages exist that will give future engineers new-found freedom in tailoring the combustion process. One great advantage is that the stroke magnitude and rate can be different for different strokes in the cycle (i.e., intake, compression, power, and exhaust). This provides the possibility of converting more energy to shaft power by greater expansion during the power stroke compared to the compression stroke.

Another advantage is the ability to complete any even number of strokes per revolution in a single rotor. This effectively multiplies the power output proportionally if the stroke is maintained constant. Current concentration is on 2 and 4 stroke designs, but 8 or 12 or more stroke rotors are feasible, only limited by centrifugal loads at high speeds for a given rotor size. In addition, rotors can be stacked axially to increase power.

Recently, an engineering breakthrough has enabled the virtual elimination of inertial forces that contribute to friction in the ball piston machine. Friction losses are thus low and independent of operating speed, in contrast to conventional piston engines, where friction losses increase with speed. In addition, recent simulated compressor testing has shown that remaining friction can be nearly completely eliminated by hydrodynamic action of lubricant at the ball piston

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