Automotive Radial Turbine Expander Design WHR

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Automotive Radial Turbine Expander Design WHR ( automotive-radial-turbine-expander-design-whr )

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108 integrated real gas EoS and determines the geometric and performance parameters using the genetic optimisation algorithm in Section β€Ž5.2. 5.3.1 General Stage Modelling For simplicity, fluid properties are assumed to be constant on a plane normal to its direction of motion. Therefore, these properties vary only along the mean streamline of the blade [233]. Assuming the acceptable values of performance and geometric parameters is commonpractice to proceed with the design. Table β€Ž5-1 presents the input parameters specified by the designer. The exit radii π‘Ÿ5𝑕 and π‘Ÿ5𝑑 are not arbitrarily selected, as explained in Section β€Ž5.4. Table β€Ž5-1: Design Input Parameters Thermodynamic Inputs Parameters Unit Performance Input Parameter Unit Geometric Inputs Parameter Unit Specific speed,𝑁 or Ρ°and πœ‘ - Radius ratio,π‘Ÿ π‘Ÿ - Radius ratio,π‘Ÿ π‘Ÿ - 𝑇 K 01 𝑠 34 𝑃 kPa 01 𝑃 kPa 5 π‘š. Kg/s 5𝑕 4 The design procedure using 𝑁𝑠is an improved version of the methodology explained in [234]. Three non-dimensional parameters, namely, specific speed (𝑁𝑠), velocity ratio (𝑣𝑠)and total to static efficiency (πœ‚π‘‘π‘ ), are used to begin with the design procedure. These correlations are widely applied with ideal gases. 𝑣 =0.737𝑁0.2 𝑠𝑠 πœ‚π‘‘π‘  =0.87βˆ’1.07 𝑁𝑠 βˆ’0.55 2 βˆ’0.5 𝑁𝑠 βˆ’0.55 3 (β€Ž5-2) (β€Ž5-3) Considering that the stagnation temperature and pressure are given, the other thermodynamic properties can be easily found using EoS, as shown in equation (β€Ž5-4). Figure β€Ž4-3shows that 𝑠5𝑠 = π‘ π‘œ1 based on the h–s diagram. In addition, the isentropic pressure at the rotor exit 𝑃5𝑠 is calculated from the

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