Research On Operating Characteristics And Internal Flow Field Of RG/2MC Gas Pressure Regulator

Under the background of China’s "dual carbon" goal,natural gas,as a clean fossil energy,will achieve sustained and rapid development in the next many years.As the most important pressure stabilization and pressure regulation equipment in the gas pipeline network,the adjustment performance of the gas pressure regulator has become the key to cope with the increasingly complex gas consumption law.At present,most domestic voltage regulators still have many shortcomings in terms of regulation ability and research and development methods,and it is urgent to further study the operating characteristics and performance optimization of voltage regulators.In this article,RG/2MC gas pressure regulator is taken as the research object,and the regulation characteristics and internal flow field of the pressure regulator are studied by combining experimental research and numerical simulation,so as to provide guidance for the R&D,design and performance optimization of the gas pressure regulator.The main work of this article is as follows:（1）According to the relevant standards,a static characteristics test platform for gas pressure regulators was built,and the pressure regulation characteristics of the studied pressure regulator were tested by the flow characteristic test method,and the flow static characteristic curves of the pressure regulator P_2min=5.5KPa and P_2max=10.OKPa were obtained,and the outlet pressure value P₂ showed the law of first decreasing and then increasing with the increase of the test flow Q_L.The voltage regulation accuracy level of the calculated regulator is AC10 and the closing pressure grade is SG20,which meets the product calibration and has good pressure regulation performance.（2）A series of three-dimensional calculation models of pressure regulators with different port openings are established,numerical simulation setting methods suitable for the same type of pressure regulators are summarized,and the influence of port opening s’,inlet pressure P₁ and outlet pressure P₂ on the internal flow field of the regulator is analyzed.With the decrease of s’,the rapid pressure relief zone gradually moves from the high-pressure cavity of the valve port to the inside of the valve port;The low-temperature,high-speed flow area at the outlet moves towards the valve port position and forms a vortex zone under the disc and at the pressure extraction surface of the signal tube.With the increase of the pressure difference between the inlet and outlet,the low-pressure,low-temperature and high-speed flow zones at the outlet position gradually increase,the global maximum airflow velocity increases by about 63.0m/s,the airflow stability at the outlet position deteriorates,the minimum airflow temperature decreases by about 12.3K,and the hidden danger of freeze plugging operation failure increases.（3）Mathematical modeling of the internal structure of the regulator.The change relationship between the effective area of the main film A₁ and the displacement S of the valve stem was fitted,the numerical simulated force surface was corrected,the precompression amount of the regulator regulating spring s₀ was determined,and the force equation of the pressure regulator stem was established according to the numerical simulation results of the rated working conditions of the regulator.Based on the principle of force balance of the valve stem,multiple sets of actual working conditions in the numerical simulation are determined,and the numerical simulation flow characteristic curve of the pressure regulator is obtained.The outlet pressure value decreases with the increase of the flow,compared with the experimental value,when the flow rate is160～470N m³/h,the relative error of the value is less than 4.7%,and when the flow rate is small or the flow rate is large,due to the influence of the "three major effects" of the regulator and the pressure taking method,the experimental value deviates greatly from the simulated value,which meets the model assumption conditions,verifies the accuracy of the numerical simulation setting method and the stem force equation,and provides reliable technical support for the subsequent pressure regulator design and performance optimization.