Abstract
Radial-inflow turbines (RI turbines) are critical components of air cycle machines (ACM), utilized in environment conditioning systems (ECS). In this work, a process is presented for the full design of a radial-inflow turbine, including volute, nozzle blade row and rotor blade row. The preliminary and detailed aerodynamic design approaches are explained in detail. A mean-line (1D) analysis method coupled with the preliminary design is employed to evaluate the aerodynamic performance of the RI turbine. Then, ANSYS CFX is used to perform unsteady 3D simulations of the designed RI turbine at design and off-design conditions to predict the aerodynamic performance of the turbine for future optimization.
Highlights
Compact air cycle machines (ACM) have been widely employed in many industrial applications, such as environment conditioning systems (ECS) and air cycle refrigeration
This paper presented a full design process for the radial-inflow turbine (RI turbine) used in an air cycle machine (ACM)
The preliminary design was coupled with a mean-line (1D) analysis to evaluate aerodynamic performance
Summary
Compact air cycle machines (ACM) have been widely employed in many industrial applications, such as environment conditioning systems (ECS) and air cycle refrigeration. The coefficient of performance (COP) of the cooling cycles changes dramatically by efficiency and pressure ratio of the ACM [1,2]. The radial-inflow (RI) turbine is an indispensable member of the ACM, which is regularly used in compact air cooling systems because of its reliability, simplicity and robust construction, fast response, various working fluids (such as organic working fluids), low emission and low manufacturing cost [3,4,5]. The aerodynamic design of the radial-inflow turbines is efficiently accomplished in well-known steps. A preliminary design is performed to calculate the basic stage component dimensions
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