METHOD AND MEASURING APPARATUS FOR DETERMINING PHYSICAL PROPERTIES OF GAS

摘要

A method for determining physical properties of combustion including: flowing a gas a critical nozzle and past a microthermal sensor wherein the mass flow of the gas through the critical nozzle is the same as the mass flow through the microthermal sensor; measuring the pressure drop in a reservoir of gas flowing to the nozzle; determining a first gas property factor based on the measured pressure drop; determining a second gas property factor based on a flow signal generated by the microthermal sensor; determining a thermal conductivity of the gas using the microthermal sensor; and determining a physical property of the combustion based on a correlation of the first and/or second gas property factors and the thermal conductivity.

主权项

1. A method for determining physical properties and/or quantities relevant to combustion of a gas and/or a gas mixture, the method comprising:
flowing the gas and/or gas mixture from a gas reservoir through a critical nozzle and past a microthermal sensor, with the same mass flow is applied to the critical nozzle and the microthermal sensor; measuring a pressure drop in the gas reservoir as a function of time; determining a first gas property factor (Γ*), which is dependent on a first group of physical properties of the gas and/or gas mixture, on the basis of the measured pressure drop; determining a second gas property factor (Γ), which is dependent on a second group of physical properties of the gas or gas mixture, from a flow signal generated by the microthermal sensor; determining the thermal conductivity (λ) of the gas and/or gas mixture using the microthermal sensor; and determining a physical property and/or quantity relevant to combustion from the first and/or second gas property factor (Γ*, Γ) and the thermal conductivity (λ) through correlation.