Turbo flutter7/30/2023 ![]() On the turbine-side the exhaust first passes through the high-pressure turbine and then on to the low-pressure turbine before being routed out through the tailpipe. The low-pressure compressor feeds the high-pressure compressor which then feeds the intake. ![]() A larger turbo is designated as the “low-pressure” turbo and the smaller secondary stage as the “high pressure” turbo. This is a situation where one turbo feeds another turbo, sharing the work of compressing the air across both compressors. At this power level, as stated above, it is a good idea to consider a series turbo application. There are, however, some general guidelines. Since this is a special case and there are so many ways to go about an ultimate power diesel application, it is not possible to cover it adequately in this article. The final case is the Competition category. With this, we can calculate Pressure Ratio ( ) using the equation. = Pressure loss due to Air Filter/Piping (psi).We will need to subtract the 1 psi pressure loss from the ambient pressure to determine the Compressor Inlet Pressure (P1). Also, we are going to assume that we are at sea level, so we are going to use an ambient pressure of 14.7 psia. In the Pressure Ratio discussion earlier we said that a typical value might be 1 psi, so that is what will be used in this calculation. ![]() To get the correct inlet condition, it is now necessary to estimate the air filter or other restrictions.
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