CN-121994370-A - Method and test device for acquiring fuel temperature involved in fuel flow calculation

CN121994370ACN 121994370 ACN121994370 ACN 121994370ACN-121994370-A

Abstract

The invention provides a method and a test device for acquiring fuel temperature involved in fuel flow calculation, wherein the method is used for acquiring the fuel temperature involved in fuel flow calculation under a flight state and comprises the steps of S 1 , arranging a fuel flowmeter on a flowmeter standard table, wherein the fuel flowmeter is provided with a self-contained temperature measuring point sensor, arranging a fuel pipeline central temperature measuring point sensor on the flowmeter standard table, arranging a wall temperature measuring point sensor on the outer wall surface of the fuel flowmeter, S 2 , carrying out a fuel temperature test, acquiring temperature data of each measuring point sensor, S 3 , carrying out data processing on the acquired temperature data to form a mathematical relation between the temperature data of the self-contained temperature measuring point sensor of the fuel flowmeter and the temperature data of the rest temperature measuring point sensors, and S 4 , and verifying the formed mathematical relation. The invention is used for correcting the temperature measurement error of the fuel flow meter by establishing the relation between the fuel temperature measured by the fuel flow meter and the temperature of the rest measuring points.

Inventors

GUO SHAN
LI HONGMEI
CAO RONG
HUANG CHENG

Assignees

中国航发商用航空发动机有限责任公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (13)

1. A method for obtaining a fuel temperature involved in a fuel flow calculation, the method being for obtaining a fuel temperature involved in a fuel flow calculation in a flight state, comprising the steps of: S 1 , arranging a fuel flow meter on a flow meter standard table, wherein the fuel flow meter is provided with a self-contained temperature measuring point sensor; S 2 , performing a fuel temperature test, and collecting temperature data of each measuring point sensor; S 3 , carrying out data processing on the acquired temperature data to form a mathematical relation between the temperature data of a temperature measuring point sensor of the fuel flowmeter and the temperature data of the rest temperature measuring point sensors; and S 4 , verifying the formed mathematical relation.
2. The method for obtaining the fuel temperature involved in the fuel flow calculation according to claim 1, wherein the flow meter standard table is a fuel medium flow table, front and rear pipelines of the fuel flow meter are straight pipelines, the length of a straight pipeline section in the fuel inflow direction is more than or equal to 10 times of the inner diameter of the fuel flow meter, and the length of a straight pipeline section in the fuel outflow direction is more than or equal to 5 times of the inner diameter of the fuel flow meter.
3. The method for obtaining the fuel temperature involved in the calculation of the fuel flow according to claim 1, wherein the flow meter standard table is provided with a simulated environmental chamber in a matched manner for performing the temperature change.
4. The method of obtaining a fuel temperature involved in a fuel flow calculation according to claim 2, wherein the fuel line central temperature sensor comprises a first central temperature sensor and a second central temperature sensor, and the first central temperature sensor and the second central temperature sensor are arranged in a manner such that: the temperature measuring probe of the first central temperature measuring point sensor is arranged at the center of the pipeline and positioned at the end face of the fuel flow meter in the fuel flow direction, and the temperature measuring probe of the second central temperature measuring point sensor is arranged at the center of the pipeline and positioned at the end face of the fuel flow meter in the fuel flow direction.
5. The method of obtaining a fuel temperature involved in a fuel flow calculation according to claim 2, wherein the wall temperature measuring point sensor includes a first wall temperature measuring point sensor and a second wall temperature measuring point sensor, and the wall temperature measuring point sensor is arranged in such a manner that: the first wall temperature measuring point sensor is arranged at the middle position of the arc-shaped junction surface of the right outer wall surface of the fuel flow meter along the fuel advancing direction and the side edge, and the second wall temperature measuring point sensor is arranged at the middle position of the arc-shaped junction surface of the left outer wall surface of the fuel flow meter along the fuel advancing direction and the side edge.
6. The method of obtaining a fuel temperature involved in a fuel flow calculation according to claim 5, wherein the first wall temperature measuring point sensor and the second wall temperature measuring point sensor are located on the same radial cross section of the fuel flow meter and are bilaterally symmetrical to the vertical direction.
7. The method of obtaining a fuel temperature involved in a fuel flow calculation according to claim 1, wherein the wall temperature measuring sensor is a patch type platinum thermal resistance sensor.
8. The method for obtaining the temperature of the fuel involved in the calculation of the fuel flow rate according to claim 1, wherein the step S 1 further comprises providing a cylindrical shield around the fuel flow meter, the fuel line central temperature sensor, and the wall temperature sensor.
9. The method of claim 1, wherein in the step S 2 , the temperature data of the self-contained temperature sensor of the fuel flow meter is T a , the temperature data of the central temperature sensor of the fuel line is T w , and the temperature data of the wall temperature sensor is T b ; In the step S 3 , the mathematical relationship among the three components T a 、T b 、T w is analyzed based on the principle of heat transfer theory, the linear relationship among the three components is assumed, and test data under all working conditions obtained through tests are subjected to fitting treatment to obtain a definite mathematical relationship formula of T w ＝α*T a +β*T b +ζ, wherein alpha and beta are coefficients corresponding to different temperatures in different intervals, and ζ is a constant.
10. A fuel temperature test device, characterized in that the test device is used for implementing the method for acquiring the fuel temperature involved in the calculation of the fuel flow according to any one of claims 1-9, and the test device comprises a fuel flow meter, an oil supply device and a standard, wherein the fuel flow meter, the oil supply device and the standard are sequentially connected through pipelines to form a loop.
11. The fuel temperature test device according to claim 10, wherein the front and rear pipelines of the fuel flow meter are straight pipelines, and temperature measuring points for arranging sensors are arranged on the front and rear pipelines of the fuel flow meter.
12. The fuel temperature test device according to claim 11, wherein a simulated environmental chamber is arranged outside the fuel flow meter, an environmental chamber air inlet is formed in the simulated environmental chamber, and the temperature measuring point is arranged in the simulated environmental chamber.
13. The fuel temperature testing device according to claim 12, wherein a cylindrical shield is provided inside the simulated environmental chamber outside the fuel flow meter, and the temperature measuring point is provided inside the cylindrical shield.

Description

Method and test device for acquiring fuel temperature involved in fuel flow calculation Technical Field The invention relates to the technical field of aircraft design, in particular to a method and a test device for acquiring fuel temperature involved in fuel flow calculation. Background The aircraft power device generally adopts a turbine flowmeter to measure fuel oil, and according to CCAR-33R2 aviation engine airworthiness regulation and CCAR-21-R4 civil aviation product and part qualification approval regulation, the aviation engine can accurately measure fuel oil consumption in relevant experimental subjects. According to SAE RAP4990B Turbine Flowmeter Fuel Flow Calculations, the fuel temperature is one of the influencing parameters for influencing the accurate measurement of the fuel flow meter, and accurate measurement of the fuel temperature flowing through the flow meter is very important for improving the accuracy of fuel measurement. Usually, the fuel temperature of the aircraft engine must be obtained by measurement means, in reality, the measurement points are often arranged in the fuel flow meter itself or front and rear pipelines, but the measurement point probe is required to not influence the fuel flow field, and usually, indirect methods are adopted for measurement, such as mounting the measurement points in the inner wall of the flow meter, and making the measurement points sufficiently close to the fuel fluid but not close to the fuel fluid, even if the measured fuel temperature is still not the fuel central temperature. Two methods commonly used at present are as follows: (1) Installing a temperature sensor at a certain distance from the flowmeter, wherein the temperature sensor is too close to adversely affect the convection field, and the temperature drop effect is considered when too far; (2) The temperature sensor of the flowmeter is directly used, the temperature measuring point of the current installed double-turbine flowmeter is positioned in the metal wall surface of the flowmeter, is 2mm away from the fluid and does not contact the fluid (see figure 1), and the measured temperature and the central temperature of the oil product can have certain difference. Both of the above measurement methods are very rough and it is difficult to accurately obtain the temperature of the fuel flowing through the flow meter. In view of this, the inventors of the present application devised a method and a test apparatus for obtaining a fuel temperature involved in fuel flow calculation in order to overcome the above-mentioned technical problems. Disclosure of Invention The invention aims to overcome the defects that in the prior art, measuring points are often arranged in a fuel flow meter or front and rear pipelines, but a measuring point probe is required to not influence a fuel flow field, and an indirect method is generally adopted for measurement, so that the measured fuel temperature is still not the central temperature of fuel. The invention solves the technical problems by the following technical proposal: The invention provides a method for acquiring fuel temperature involved in fuel flow calculation, which is characterized by comprising the following steps of S 1, arranging a fuel flowmeter on a flowmeter standard table, arranging a fuel pipeline central temperature measuring point sensor on the flowmeter standard table, arranging a wall temperature measuring point sensor on the outer wall surface of the fuel flowmeter, S 2, carrying out fuel temperature test, acquiring temperature data of each measuring point sensor, S 3, carrying out data processing on the acquired temperature data, forming a mathematical relation between the temperature data of the temperature measuring point sensor of the fuel flowmeter and the temperature data of the other temperature measuring point sensors, S 4, and verifying the formed mathematical relation. According to one or more embodiments of the invention, the flow meter standard table is a fuel medium flow table, front and rear pipelines of the fuel flow meter are straight pipelines, the length of a straight section of the pipeline in the fuel inflow direction is more than or equal to 10 times of the inner diameter of the fuel flow meter, and the length of a straight section of the pipeline in the fuel outflow direction is more than or equal to 5 times of the inner diameter of the fuel flow meter. According to one or more embodiments of the invention, the flowmeter standard table is provided with a simulated environment cabin in a matching way for changing temperature. According to one or more embodiments of the invention, the fuel line central temperature measuring point sensor comprises a first central temperature measuring point sensor and a second central temperature measuring point sensor, and the arrangement method of the first central temperature measuring point sensor and the second central temperature measuring point sensor is that a temperature