Derive the nondimensional groups that are normally used in the testing of gas turbines and compressors. A compressor has been designed for normal atmospheric conditions (101.3 kPa and 15°C). To economize on the power required, it is being tested with a throttle in the entry duct to reduce the entry pressure. The characteristic curve for its normal design speed of Problems 65 4000 rpm is being obtained on a day when the ambient temperature is 20°C. At what speed should the compressor be run? At the point on the characteristic curve at which the mass flow would normally be 58 kg/s, the entry pressure is 55 kPa. Calculate the mass flow rate during the test.

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.