Input the parameters such as inlet pressure, inlet temperature, outlet pressure, polytropic efficiency, compressor piston diameter, connecting rod diameter, and the mass or mole number of each gas component to calculate the compression ratio, outlet temperature, volume efficiency, flow, power, etc
Bibliography: Qian Xijun P (123), the second edition of Pumps and Compressors, calculates according to the formula, where z is the number of blades;δ is blade thickness, mm; △ is flange thickness, mm; b is impeller axial flow passage width, mm; β A is blade angle, °
Bibliography: The Second Edition of Pumps and Compressors Qian Xijun P (123) When the gas enters the impeller blade channel radially, there is α 1=90 °, c1u=0, (c1u impeller inlet circumferential partial velocity), which is called no pre rotation.The theoretical energy head without prerotation is HT=u2c2u=u22 (1 - φ 2rcot (β 2A) - π sin (β 2A)/z), where β 2A is
Stodola believed that the rotational speed of the axial whirl socket was the same as that of the impeller, but in the opposite direction;It is assumed that the diameter of the axial swirl recess is approximately equal to the effective width of the impeller blade passage.Stodora formula is the earliest formula to calculate the slip coefficient.Although it also has some assumptions, it has been proved that it is suitable for backward curved blades
Bibliography: Shen Weidao P46 (33), the third edition of Engineering Thermodynamics, often has U+PV in thermal calculation. In order to simplify the calculation, it is defined as enthalpy, represented by H, that is, H=U+PV, where U is the thermodynamic energy, J; P is the absolute pressure, Pa; V is the volume, m3; H is the enthalpy, J;
For a reversible process, δ W=Fdx=pAdx=pdV, so W1-2=π 12PdV;For a reversible constant pressure process, W1-2=P ＋ 12dV=P (V2-V1);Wherein, W1-2 is the volume work (expansion work/compression work) from state 1 to state 2, J; P is the absolute pressure, Pa; V1 and V2 are the volumes of state 1 and state 2 respectively
Bibliography: Shen Weidao P (64), the third edition of Engineering Thermodynamics, is calculated according to the formula △ S1-2=CVln (T2/T1)+Rgln (v2/v1), where △ S1-2 is the entropy change from state 1 to state 2, J/(kg · K);CV is the specific heat of constant volume, J/(kg · K);T1, T2 are the thermodynamic temperatures of states 1 and 2
Calculate according to the formula △ S1-2=CVln (T2/T1)+Rgln (v2/v1), where △ S1-2 is the entropy change from state 1 to state 2, J/(kg · K);CV is the specific heat of constant volume, J/(kg · K);T1 and T2 are the thermodynamic temperatures of states 1 and 2, K; v1 and v2 are the specific volumes of states 1 and 2, m3/kg; Rg is the gas constant
Bibliography: Shen Weidao P (64), the third edition of Engineering Thermodynamics, is calculated according to the formula △ S1-2=CPln (T2/T1) - Rgln (P2/P1), where △ S1-2 is the entropy change from state 1 to state 2, J/(kg · K);CP is specific heat at constant pressure, J/(kg · K);T1, T2 are thermodynamic temperatures of states 1 and 2, K; P1
Calculate according to the formula Pv=ZRgT, where P is the absolute pressure, Pa; v is the specific volume of gas, m3/kg; Z is the compression factor, Z=1 for ideal gas;Rg is the gas constant, J/(kg · K);T is the thermodynamic temperature, K;
Calculate according to the formula PV=ZnRT, where P is the absolute pressure, Pa; V is the gas volume, m3; Z is the compression factor, Z=1 for ideal gas;N is the amount of substance, mol; R is the molar gas constant, R=8.3145 J/(mol · K);T is the thermodynamic temperature, K;
