A polytropic process is a thermodynamic process that obeys the relation: = where p is the pressure, V is volume, n is the polytropic index, and C is a constant. The polytropic process equation describes expansion and compression processes which include heat transfer.

2019年5月22日 · Definition and characteristics of Polytropic Process. Thermal Engineering. A polytropic process is any thermodynamic process that can be expressed by the following equation: pVn = constant. The polytropic process can describe gas expansion and compression which include heat transfer.

In practice most expansion and compression processes are somewhere in between, or said to be polytropic. The polytropic process can be expressed as. p V n = constant (3a) or . p 1 V 1 n = p 2 V 2 n (3b) where . n = polytropic index or exponent (ranging 1 to 1.4)

2011年2月2日 · Many gas compression and expansion processes may be usefully approximated by a polytropic process. In each case the polytropic coefficient must be determined experimentally by measurement of the heat and work transfer and the initial and final states.

1. Polytropic compression : definition. The compression of gases in compressors is often idealized as isentropic, which means that there are no friction, no leakage of gas in between high and low pressure side, and that the compressor is perfectly insulated.

Polytropic Process of an Ideal Gas • The relationship between the pressure and volume during compression or expansion of an ideal gas can be described analytically. One form of this relationship is given by the equation pVn = constant • where n is …

Figure 2 provides some insight. Consider a polytropic compression with 1 < < that, starting from the right edge of the figure, decreases the volume and increases the pressure. The figure shows three red isotherms (lines of constant tem - perature) …

To derive the expression for work done in a polytropic process, let’s consider a system undergoing compression or expansion. This process can be represented mathematically using the following equation: $$P * V^n = Constant$$, where P represents the pressure, V denotes the volume, and n is the polytropic index.

Polytropic processes are particularly useful for modeling the compression and expansion stages in devices like compressors, turbines, pumps, and engines. The flexibility in representing different processes makes them applicable in a wide range of engineering applications.

2011年8月27日 · This article will help you solving any polytropic work equation problem of polytropic compression process or poly tropic expansion process.