The exhaust gas discharged from the engine is channeled to the t/c inlet casing after being expanded and accelerated by means of a nozzle ring and fed to a radial turbine which converts the kinetic energy into roto motive force of shaft, which in turn turns a axial compressor impeller which channels external air through silencer and accelerates it whose kinetic energy is converted to pressure energy by a diffuser and fed to the engine
Since very small needle lift is obtained in the test equipment result in an unequal pressure distribution in the cut off shaft resulting in a hard contact in a small area along with high frequency oscillations, low lubricity of test oil will increase the chance of seizure. Full lift and high lubricity of heavy oil eliminates this risk of seizure during normal operation.( Always open and clean slide type valves before testing as cold sticky heavy oil along with small clearances can cause restriction in the movement of the spindle).
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