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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Compressor characteristic ： ウィキペディア英語版 Compressor characteristic Compressor characteristic is the curve to show the behaviour of fluid like change in pressure, temperature, entropy, flow rate etc. as it passes through the compressor at different compressor speeds. The function of a compressor is to increase the pressure of a fluid passing through it, so that the exit pressure is higher than the inlet pressure. Due to this property, compressors are used in a wide range of machines, such as refrigerators, cars and jet engines. These curves are plotted between various parameters and some are as follows ==Pressure ratio vs. Non-dimensional flow rate〔Klassen, H.A., `Performance of low pressure ratio centrifugal compressors with four diffuser designs`, NACA, TN 7237, March 1973.〕〔Nahimo, T. Et al., `Effect of Reynolds number on performance characteristics of centrifugal compressors with special reference to configurations of impellers`, ASME paper No.74-GT-59, 1974.〕〔Yahya ,S.M, ”Turbine, Compressors & Fans”,4TH ED.McGraw Hill,2011.〕== Performance of a compressor is usually specified by curves of delivery pressure against mass flow rate for various fixed values of rotational speed at given values of inlet pressure and temperature. These performance characteristic curves are usually plotted with dimensionless variables for this we start with implicit functional relationship of all the variables as 〔 $F\; (D,\; N,\; \backslash dot,\; p\_,\; p\_,\; RT\_,\; RT\_)\; =\; 0$ 〔〔Horlock, J.H., Axial Flow Turbines, Kruger Publishing Co., 1973.〕〔Horlock, J.H., Axial Flow Compressors, Kruger Publishing Co., 1973.〕 Where $D$ = characteristic linear dimension of the compressor $N$ = rotational speed $\backslash dot$ = mass flow rate $p\_$ and $p\_$ = stagnation pressure at compressor inlet and outlet $T\_$ and $T\_$ = stagnation temperature at compressor inlet and outlet $R$ = characteristics gas constant By making use of π-theorem, we obtain the non-dimensional groups (π terms) as 〔 $\backslash frac\; \backslash$, $\backslash frac\; \backslash$, $\backslash frac\; \}\; \}\backslash$, $\backslash frac\; \backslash$ When we are concerned with the performance of a machine of fixed size compressing a specified gas and D may be omitted from the groups and we can write $F\; \backslash left(\; \backslash frac\; \backslash \; ,\; \backslash frac\; \backslash \; ,\; \backslash frac\; \}\; \backslash \; ,\; \backslash frac\; \backslash \; \backslash right)\; =\; 0$ 〔 Though the terms $\backslash frac\; \}\; \backslash$ and $\backslash frac\; \backslash$ are truly not dimensionless, they are referred as 'non-dimensional mass flow' and 'non-dimensional rotational speed' for practical purpose. The stagnation pressure ratio $\backslash frac\; \backslash$ is plotted against$\backslash frac\; \}\; \backslash$ in the form of family of curves, each curve of a family being drawn for fixed values of $\backslash frac\; \backslash$ as shown in Figure 1. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Compressor characteristic」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.