An Investigation of Steady and Unsteady Flow through a Napier Turboblower Turbine under Conditions of Full and Partial Admission

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Abstract
The paper presents the results of tests on an axial-flow turbine and describes how they are obtained, in steady and unsteady flow. An analysis of turbine-test results obtained under the unsteady operating conditions is then given. It is shown that over a limited range of cyclic operation the mass flow and power output may be predicted by assuming that the turbine operates instantaneously as it would under steady-flow conditions (at the same expansion ratio and the same non-dimensional rotational speed) and integrating over the engine cycle. At high pressure ratios, pulse frequencies and rotational speeds, this ‘quasi-steady’ analysis gives a slight overestimate of mass flow and power output but the error in turbine efficiency is very small.

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