Experimental Research and Identification Method of Nondimensional Fluid Flow Parameters within Orifices of Spool-Type Hydraulic Control Valves

The article discusses the study results and development of the identification method of non dimensional fluid flow parameters (flow coefficients, flow compression coefficients, and Reynolds’ number) within rectangular and segmental orifices of two- and four-throttle spool-type hydraulic control valves of the electrohydraulic boosters. Both the study and the identification method are based on the developed technique for determining these parameters. A novel experimental setup was used to carry out the research. It allowed detecting pressures in the pressure and discharge chambers, as well as in the working chamber of the spool valve, traveling of the spool-type plunger, and a flow of the working fluid at the outlet of the working and discharge chambers respectively. The research was carried out with the help of a computer program which determined nondimensional parameters of the working fluid flow using the obtained experimental data. A spline interpolation-extrapolation of the obtained correlations and an iterative identification method of nondimensional parameters of the working fluid flow within the orifices of the spool valves of the electrohydraulic boosters are introduced.

References

[1] Taft C.K., Twill J.P. An Analysis of the Three-Way Underlepped Hydraulic Spool Servovalve. Transaction of ASME. Journal of Dynamic Systems, Measurement and Control. June 1978, vol. 100, pp. 117-123.

[2] Weule H. Eine Durchflubgleichung fur den laminar-turbulenten Stromungsbereich. Olhydraulik und Pneumatik, vol. 18, 1974, pp. 57-67.

[3] Popov D.N. Dinamika i regulirovanie gidro- i pnevmosistem [Dynamics and Control of Hydraulic and Pneumatic Systems]. Moscow, Mashinostroenie Publ., 1987. 464 p.

[4] Popov D.N., Ermakov S.A., Loboda I.N. Inzhenernye issledovaniya gidroprivodov letatel’nykh apparatov [Engineering Studies of Aircraft Hydraulic Actuators]. Moscow, Mashinostroenie Publ., 1978. 142 p.

[5] Fomichev M.V., Biryukov O.Ya., Chaykovskiy Yu.V. On The Influence of the Backpressure and Flow Passage Configuration on the Flow Characteristics of the Valve Spools. Aviatsionnaya promyshlennost’ [Aviation Industry], 1974, no. 4, pp. 32-34 (in Russ.).

[6] Al’tshul’ A.D. Mestnye gidravlicheskie soprotivleniya pri dvizhenii vyazkikh zhidkostey [Local Hydraulic Resistance in Moving Viscous Liquids]. Moscow, Gostoptekhizdat Publ., 1962. 116 p.

[7] Bashta T.M. Gidravlicheskie privody letatel’nykh apparatov [Aircraft Hydraulic Actuators]. Moscow, Mashinostroenie Publ., 1969. 469 p.

[8] Vakina V.V. On the Influence of Backpressure on the Flow Coefficient in the Outflow of Fluids through Choke Flanges of Small Cross Sections. Gidroprivod i gidropnevmoavtomatika [Hydraulic Actuators and Hydraulic and Pneumatic Automated Equipment]. Kiev, Tekhnika, 1968, iss. 3. pp. 74-80 (in Russ.).

[9] Danilov Yu.A., Kirillovskiy L., Kolpakov Yu.G. Apparatura ob’emnykh gidroprivodov: Rabochie protsessy i kharakteristiki [Fluid Power Drive Equipment: Operating Processes and Performance]. Moscow, Mashinostroenie Publ., 1990. 272 p.

[10] Sposob opredeleniya kharakteristik bezrazmernykh parametrov techeniya potokov rabochey zhidkosti v drossel’nykh oknakh zolotnikovykh gidroraspredeliteley [A Method for Determining the Characteristics of the Dimensionless Parameters of the Actuating Fluid Current Flow in the Orifices of Spool Valve Actuators]. Patent RF no. 2220333, 2003.

[11] Sposob opredeleniya kharakteristik bezrazmernykh parametrov techeniya potokov rabochey zhidkosti v drossel’nykh oknakh zolotnikovykh gidroraspredeliteley [A Method for Determining the Characteristics of the Dimensionless Parameters of the Actuating Fluid Current Flow in the Orifices of Spool Hydraulic Valves]. Patent RF no. 2282065, 2006.

[12] Belonogov O.B. Research of Hydrodynamic Forces Acting on the Plunger Pistons of Four-Throttle Steering Engines. Raketno-kosmicheskaya tekhnika [Rocket and Space Technology], ser. XII, 1998, iss. 3-4, pp. 57-89 (in Russ.).

[13] Belonogov O.B. Methods for Calculating the Static Characteristics of Autonomous Single-Stage Steering Engines with Two-Throttle Electrohydraulic Amplifier with Negative Overlap. Raketno-kosmicheskaya tekhnika [Rocket and Space Technology], ser. XII, 1997, iss. 1, pp. 5-28 (in Russ.).

[14] Belonogov O.B. Methods for Calculating the Static Characteristics of Autonomous Single-Stage Two-Throttle Steering Engines. Raketno-kosmicheskaya tekhnika [Rocket and Space Technology], ser. XII, 1998, iss. 3-4, pp. 132-177 (in Russ.).

[15] Belonogov O.B. Experimental Research and Identification of Flow Efflux Angles in Extension Orifices of Spool Valve Actuators of Rocket Steering Engines. Vestn. Mosk. Gos. Tekh. Univ. im. N.E. Baumana, Mashinostr. [Herald of the Bauman Moscow State Tech. Univ., Mech. Eng.], 2015, no. 1, pp. 35-48 (in Russ.).

[16] Belonogov O.B. An Iterative Method for Calculating the Parameters of the Actuating Fluid Flow in the Connecting Pipes, Ducts, Valves and Flow Cell. Raketno-kosmicheskaya tekhnika [Rocket and Space Technology], ser. XII, 1997, iss. 1, pp. 97-106 (in Russ.).

[17] Belonogov O.B., Zharkov M.N. Modification of Seidel Method for Calculating Static Characteristics of Steering Engines and Electrohydraulic Actuators. Raketno-kosmicheskaya tekhnika [Rocket and Space Technology], ser. XII, 1997, iss. 1, pp. 528 (in Russ.).