A Roots compressor is analyzed to ascertain the feasibility of using the device to produce high-temperature air. The production of high tem?perature is associated with the leakage of the hot outlet air through the tip clearance to the inlet and the subsequent mixing with the supply air. This regenerative effect allows the compressor to operate with a much higher temperature at its inlet than is available from the supply.nThe calculated performance of such a unit is very sensitive to the assumed value of Stanton number. For example, for estimated reasonable values of Stanton number of 0.002 and 0.003, the maximum calculated outlet temperatures were 7000° and 5000° R, respectively. For a net flow of 1 pound per. second, the speed, rotor diameter, and clearance assume values of the order of 3000 to 4000 rpm, 3 to 4 feet, and 0.05 to 0.15 inch, respectively.
展开▼
