Calculation method for predicting high-temperature thermodynamic properties by using specific constant pressure heat capacity
A constant-pressure heat capacity and calculation method technology, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as difficult measurement and difficult to meet engineering density accuracy requirements, and achieve strong versatility and high practical value Effect
Pending Publication Date: 2021-07-23
XI AN JIAOTONG UNIV
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Problems solved by technology
In order to calculate the thermodynamic properties of high temperature and high pressure, it is also necessary to determine the high temperature density of the substance, but the relevant experimental measurement is often difficult, and it is difficult to meet the accuracy requirements of the actual engineering density
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[0034]The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. The present invention is described in further detail below in conjunction with accompanying drawing:
[0035] figure 1 It is an iterative flow of the calculation method for predicting high-temperature thermodynamic properties by using specific heat capacity at constant pressure. The prediction of properties has the characteristics of simplicity, quickness, strong versatility and high practical value;
[0036] figure 2 and image 3 They are the calculated values and literature values of the expansion coefficient and density...
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The invention discloses a calculation method for predicting high-temperature thermodynamic properties by using specific constant pressure heat capacity, which comprises deducing from a second entropy equation and the basic definition of the thermodynamic properties to obtain a high-temperature thermodynamic property calculation model; the constant-pressure expansion coefficient and the density in the whole temperature range can be obtained by performing numerical integration calculation along the temperature direction only by means of the change relation between the specific constant-pressure heat capacity and the pressure in a certain temperature range and the density and the constant-pressure expansion coefficient in an initial state. According to the calculation method for predicting the high-temperature thermodynamic properties by using the specific constant-pressure heat capacity, the physical significance of the thermodynamic properties and experimental data are considered, and the high-temperature thermodynamic properties including the constant-pressure expansion coefficient and the density can be calculated in the absence of high-temperature density data; the invention has the characteristics of simplicity, rapidness, high universality, high practical value and the like.
Description
technical field [0001] The invention belongs to the field of theoretical calculation of thermodynamic properties, and relates to a calculation method for predicting high-temperature thermodynamic properties by using specific heat capacity at constant pressure. Background technique [0002] Thermodynamic properties reflect the changes in temperature, pressure, density, composition, and other thermodynamic functions when a substance is in equilibrium, and play a vital role in revealing molecular interaction mechanisms and constructing basic thermodynamic processes. The research methods of thermodynamic properties are mainly divided into experimental measurement and theoretical calculation. The two complement each other and verify each other, and jointly improve the thermophysical property database of substances. Among them, experimental measurement has the characteristics of high precision, reliability and easy verification, and is the basic method for the study of thermodynam...
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IPC IPC(8): G06F30/20G06F119/08G06F119/14
CPCG06F30/20G06F2119/08G06F2119/14
Inventor 张颖占涛涛李欣陈俊帅何茂刚
Owner XI AN JIAOTONG UNIV