Calculation and correction method for thermophysical properties of single-component hydrocarbon fuel

Abstract

The invention discloses a single-component hydrocarbon fuel thermophysical property calculation correction method which comprises the following steps: selecting a to-be-analyzed single-component hydrocarbon fuel, and inputting working condition parameters; calculating the potential energy of the to-be-analyzed single-component hydrocarbon fuel molecular system, the heat flow in each direction and the fluctuation data of the stress; the thermophysical property of the single-component hydrocarbon fuel under the input working condition parameters is calculated; the thermophysical properties comprise thermodynamic properties, energy properties and transport properties; the thermophysical property of the single-component hydrocarbon fuel under the input working condition is corrected based on stability and nuclear density estimation, and a thermophysical property data set is obtained; and intersection of each thermophysical property data set of the stability correction-based single-component hydrocarbon fuel under the input working condition and each thermophysical property data set of the kernel density estimation-based correction-based single-component hydrocarbon fuel under the input working condition is solved, and an average value of data in the intersection is used as a corrected thermophysical property value.

Description

technical field [0001] The invention relates to the technical fields of power engineering, engineering thermophysics, micro-nano scale calculation and the like, in particular to a method for calculating and correcting thermophysical properties of a single-component hydrocarbon fuel. Background technique [0002] The application of hydrocarbon fuels under the background of "dual carbon" has been extended to high temperature and high pressure conditions. The injection process is often accompanied by gas-liquid phase transitions such as cavitation and flash boiling, which makes the comprehensive acquisition of thermophysical properties more complicated. [0003] At present, most of the thermophysical properties of hydrocarbon fuels are obtained based on the limited working conditions of normal temperature and pressure, and there is a lack of methods to obtain thermophysical properties under high temperature and high pressure environments. Existing thermophysical databases, such...

AI Technical Summary

Problems solved by technology

Existing thermophysical property databases such as the National Institute of Standards and Technology (NIST) predict the thermophysical parameters of hydrocarbon fuels under high temperature and pressure by means of interpolation and fitting. Comprehensive Calculation Method of Physical Parameters

[0004] Traditional molecular dynamics can provide detailed atomic-level information from the microscopic level. However, because the atomic-scale simulation does not consider the role of electrons or even more microscopic structures, and the force field potential energy parameters are inaccurate, there is a certain gap between the calculation results and the real values. deviation

Therefore, when using traditional molecular dynamics to calculate thermal physical properties, some data points deviate greatly from the preset working conditions, and the accuracy of the calculation results after averaging is poor, especially under high temperature and high pressure working conditions, the data fluctuations are more severe , resulting in larger calculation errors and worse accuracy

Images