Method for predicting, regulating and controlling wear characteristic of flow channel in valve

A method for predicting, regulating and controlling wear characteristic of a flow channel in a valve, the method comprises:

• 1) Building a circulating pipeline loop, disposing liquid phase oil and particles in the circulating pipeline loop, disposing opposite flanges in a middle region of the circulating pipeline loop, disposing a multi-stage depressurization string type liquid level regulating valve between the opposite flanges, transmitting and pressurizing the liquid phase oil and the particles in the circulating pipeline loop and regulating pressure of an inlet and an outlet of the multi-stage depressurization string type liquid level regulating valve by using a circulating pump and a pressure pump;
• 2) Defining a number of throttling times of fluid in a fluid domain between a valve core (13) and a valve sleeve (3) as a number of stages;
• 3) During a test, fixing and attaching aluminum sheets at different locations on an inner sidewall of the valve sleeve (3) and an outer sidewall of the valve core (13) at each stage in the multi-stage depressurization string type liquid level regulating valve, and attaching n pressure strain gauges and m current meters to a location near each of the aluminum sheet, real time collecting and converting to obtain m flow velocity value distributions and n pressure value distributions at different positions of the inner sidewall of the valve sleeve (3) and the outer sidewall of the valve core (13) at different times;
• after each set of experimental tests is completed, testing a wear rate KEC of the aluminum sheet based on scanning of a laser displacement sensor;
• 4) Regulating an inlet pressure of the multi-stage depressurization string type liquid level regulating valve to 11.7 MPa, using step 3) to convert the obtained n pressure value distributions and m flow velocity value distributions at different times and locations, obtaining distribution characteristics of a pressure field and a velocity field within the fluid domain;
• building cross correlation between wear rate KEC, pressure distribution and flow velocity distribution based on wear depth of the aluminum sheet obtained by the scanning of the laser displacement sensor;
• 5) Sequentially increasing and regulating the inlet pressure Pin of the multi-stage depressurization string type liquid level regulating valve at a fixed pressure interval, repeating the experimental method step 4), and respectively drawing a discrete data curve of the wear rates KEC of the aluminum sheets in different stages changing with the inlet pressure Pin;
• 6) For the discrete data curve of the wear rate KEC of the aluminum sheet changing with the inlet pressure Pin, performing data fitting to obtain a continuous curve of the wear rate of the aluminum sheet changing with the inlet pressure;
• 7) Dynamically regulating and controlling heights of different valve stems, so that the valve core is driven to move up and down, relative to the locations of the valve core sleeve, thereby adjusting opening degree of the multi-stage depressurization string type liquid level regulating valve;
• under conditions of different opening degrees, testing the wear rate of the aluminum sheet according to change of the opening degrees to obtain a discrete data curve of the wear rate of the aluminum sheet changing with the openness of the valve core, thereby obtaining a continuous curve of the wear rate of the aluminum sheet changing with the openness of the valve core through data fitting;
• further obtaining association relationship graph of the wear rate of the aluminum sheet, the inlet pressure and the opening degree of the valve core by using the continuous curve of the wear rate of the aluminum sheet changing with the inlet pressure, combined with the continuous curve of the wear rate of the aluminum sheet changing with the opening degree of the valve core;
• 8) repeating step 7), changing particle size and particle concentration, continuingly to further obtain association relationship graph of the wear rate of the aluminum sheet, the inlet pressure, the opening degree of the valve core, particle size and particle concentration;
• 9) during a dynamically regulating process, pre-setting a critical wear rate [ε] based on a wear resistant characteristic and a wear setting allowance of the aluminum sheet, and comparing based on real time dynamic wear rate actual value KEC of aluminum sheet and the critical wear rate [ε]:
• if KEC<0.95[ε], then the valve stem location, the inlet pressure and the opening degree of the valve core remain unchanged;
• if KEC≥0.95[ε], then the opening degree of the valve core, the inlet pressure, the particle size and the particle concentration are regulated, and dynamically update the real time wear rate actual value KEC of the aluminum sheet until KEC<0.95[ε], so as to avoid rapid wear and failure of the valve core.