Robert P. Benedict – författare

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THE FACT that most books on gas dynamics include separate tables for each simplified flow process casts a shadow of inadequacy over the conventional approach. Why is each process treated as though it were entirely unrelated to the others? Why isn''t there, we asked, a generalized approach based on fundamental equations which act as progenitors for the specific equations of all the simplified flow processes, and which provide insight to more general flow processes? As our solution to the above dilemma, we present a complete treatment of one-dimensional gas dynamics, stressing a fundamental approach. A unified description of this subject is accomplished by means of a single numerical table applicable to the particular gas under study. Separate treatments for the various flow processes are thus combined into one all-encompassing analysis. These tables are intended for the large group of practicing engineers, of which we are members, who daily must solve routine problems in gas dynamics. Aero­ dynamic, chemical, and mechanical engineers, as well as students of thermo­ dynamics and gas dynamics, should find these tables useful. The book is divided into five parts. In Chapter 1, we present a generalized compressible flow function r, which is shown to have direct application in the treatment of many simplified one-dimensional flow processes.

THE FACT that most books on gas dynamics include separate tables for each simplified flow process casts a shadow of inadequacy over the conventional approach. Why is each process treated as though it were entirely unrelated to the others? Why isn't there, we asked, a generalized approach based on fundamental equations which act as progenitors for the specific equations of all the simplified flow processes, and which provide insight to more general flow processes? As our solution to the above dilemma, we present a complete treatment of one-dimensional gas dynamics, stressing a fundamental approach. A unified description of this subject is accomplished by means of a single numerical table applicable to the particular gas under study. Separate treatments for the various flow processes are thus combined into one all-encompassing analysis. These tables are intended for the large group of practicing engineers, of which we are members, who daily must solve routine problems in gas dynamics. Aero­ dynamic, chemical, and mechanical engineers, as well as students of thermo­ dynamics and gas dynamics, should find these tables useful. The book is divided into five parts. In Chapter 1, we present a generalized compressible flow function r, which is shown to have direct application in the treatment of many simplified one-dimensional flow processes.

Even when one is willing to estimate the various loss coefficients in a given system, it is not always an easy matter to determine the flow rate and/or the total pressure drop across the system. While there are gas dynamics books that contain Fanno tables which involve flow with losses, such tables are never specific; that is, the conventional tabulations are never given in terms of specific loss coefficients or specific total pressure ratios. The tables contained in this book are unique in this respect. The user can establish from these tables not only the various state point functions, but the total pressure losses as well. (The total pressure ratio is shown to be the only true indica tion of loss in a flow system.) Both compressible and constant-density solutions are presented. Tables for fluids of various ratios of specific heats are included. Use of these tables is not restricted to constant-area systems, nor does their use require iterative procedures. For compressible flows, tables of solutions for both the subsonic and supersonic regimes are given. The loss coefficients obtained from these tables are unique in that they are shown to be additive in series systems. This permits the investigator to evaluate a flow system either as a series of components or in its entirety.