Flow measurement method based on dynamic optimization of three pressure sensors
A method for measuring flow rate based on dynamic optimization of three pressure sensors is provided. In the method, pressure sensors are set on the fix positions of both ends of the test straight pipe and on the middle position of the test straight pipe, and are configured to measure the pressure of the fluid at the positions where the pressure sensors are set in real time, and the real-time dynamic flow rate of the fluid in the pipe can be estimated through a flow rate calculation estimator. The method has fast response speed and high measurement accuracy, can effectively eliminate the noise interference of vibration in the environment, and has strong anti-interference ability.
1 . A device for measuring flow rate based on dynamic optimization of three pressure sensors, characterized in that, the device comprises: a test straight pipe, a flow rate calculation estimator and three pressure sensors;
the test straight pipe has an equal cross-section passage and is configured to provide a passage through which a measured fluid flows; a first pressure sensor and a second pressure sensor are respectively set on a boundary of both ends of the test straight pipe, and are configured to measure boundary pressures of two ends of the fluid in the test straight pipe; and a third pressure sensor is set on the test straight pipe between the first pressure sensor and the second pressure sensor to measure monitoring pressure of the fluid in the middle of the test straight pipe; and
the flow rate calculation estimator is respectively connected to the three pressure sensors, and is configured to acquire a flow rate of the fluid in the test straight pipe according to the boundary pressures and the monitoring pressure;
a pipe hydrodynamics module, a dynamic optimization module and a flow rate calculation module are integrated in the flow rate calculation estimator;
the pipe hydrodynamics module is configured to acquire a predicted pressure of the fluid in the middle of the test straight pipe according to the boundary pressures;
the dynamic optimization module is configured to optimize the pipe hydrodynamics module according to the predicted pressure and the monitoring pressure to enable the predicted pressure is constantly close to the monitoring pressure, so that a difference between the predicted pressure and the monitoring pressure is reduced and finally falls into a reference range which is adjusted or set according to actual accuracy requirements; and
the flow rate calculation module is configured to acquire the flow rate of the fluid in the test straight pipe according to the boundary pressures and the optimized pipe hydrodynamics module.
2 . The device for measuring flow rate based on dynamic optimization of three pressure sensors according to the claim 1 , characterized in that, the pressure of the fluid in the test straight pipe is measured by the pressure sensors in a non intrusive manner.
3 . A method for measuring flow rate based on dynamic optimization of three pressure sensors, characterized in that, the method is applied to the device for measuring flow rate based on dynamic optimization of three pressure sensors according to the claim 1 , and the method comprises:
acquiring boundary pressures of a fluid in both ends of a test straight pipe and a monitoring pressure of the fluid in the middle of the test straight pipe;
acquiring a predicted pressure of the fluid in the middle of the test straight pipe according to the boundary pressures;
optimizing a pipe hydrodynamics module according to the predicted pressure and the monitoring pressure to enable the predicted pressure constantly close to the monitoring pressure, so that a difference between the predicted pressure and the monitoring pressure is reduced and finally falls into a reference range which is adjusted or set according to actual accuracy requirements; and
acquiring a flow rate of the fluid in the test straight pipe according to the boundary pressures and the optimized pipe hydrodynamics module.
4 . The method for measuring flow rate based on dynamic optimization of three pressure sensors according to the claim 3 , characterized in that, acquiring a predicted pressure of the fluid in the middle of the test straight pipe according to the boundary pressures comprises:
inputting the boundary pressures into the pipe hydrodynamics module, and acquiring the predicted pressure by solving a pipe hydrodynamics equation according to a method of characteristics.