EXPERIMENTAL INVESTIGATIONS ON DETERMINATION OF PRESSURE FORCE OF POWER FLUID-JET STREAM ON PLANE SURFACES OF SPECIMENS HAVING VARIOUS SHAPE

The paper presents results of experimental investigations on determination of pressure force of power fluid-jet stream on plane surfaces of specimens having various shape. The results permit efficiently to realize a number of technological processes which directly depend on quality of surface cleaning from corrosion. A principle diagram has been developed for a dynamometer in order to measure a force F acting on the machined specimen with measuring range from 0 to 50 N and an error which constitutes 2 % of maximum value of the measured load. Two diagrams for jet stream flow after its interaction with the specimen have been proposed for a comparative analysis while measuring force F, namely: radial fluid spreading at angle β = 90° and reversible stream flow due to one-eighty stream turn after its interaction with plane surface of the specimen. Methodology has been established for registration of force F on plane specimens having various shape. Pressure at the nozzle input р_вх,i and distance L_i from the nozzle to the machined surface of the specimen have been taken as variable parameters for both loading diagrams (β = 90° and 180°).

Investigation results have made it possible to determine that usage of reversible stream flow ensures maximum force action on plane surface of the specimen in the investigated range of pressures р_вх = 3.5–10.0 MPa and distances from nozzle to the machined surface L = 8–30 mm. In this case maximum action force (irrespective of pressure at input р_вх and distance from nozzle to the machined surface L) is observed at stream squeezing ratio λ = 0.063 and this effect is attributed to optimum ratio of cavity diameter D0 and stream diameter d_cтр. The obtained results allow reasonably to select pump equipment and efficiently execute technology for cleaning plane surfaces from corrosion with due account of stream squeezing ratio λ which is taken as a criterion.

1. Kachanov, I. V., Filipchik, A. V. (2012) Theoretical and Experimental Investigations on Determination of JetStream Pressure of Power Fluid on The Machined Plane Surface. Nauka i Tekhnika [Science and Technique], 1, 79–85 (in Russian).

2. Kachanov, I. V., Zhuk, A. N., Shatalov, I. M., Shariy, V. N., Miadelets, S. O. (2012) Device for Cleaning Plane Steel Surfaces From Corrosion. Patent Republic of Belarus no. 16526 (in Russian).

3. Bannikov, I. I., Finkel, G. N., Kheifets, V. L. (1980) Mechanization of Cleaning and Painting of Ship’s Bottom. Leningrad, Sudostroenie. 116 p. (in Russian).

4. Agasarian, R. R. (1990) Abrasive jet Machining of Metals. Yerevan: ArmNIINTI. 51 p. (in Russian).

5. Merkulov, V. N. (1987) Prospective Processes of Materials Hydro-Treating in Mechanical Engineering. Kiev, UkrNIINTI. 10 p. (in Russian).

6. Tikhomirov, G. A. (1987) Hydro-Cutting of Shipbuilding Materials. Leningrad, Sudostroenie. 164 p. (in Russian).

7. Kraiko, A. N., Vatazhiy, A. B., Lioubimov, G. A. (2003) Mechanics of Liquid and Gas. Selection. ?oscow, FIZMATLIT. 752 p. (in Russian).

8. Vilker, D. S. (1959) Laboratory Course on Hydromechanics. ?oscow, FIZMATGIZ. 351 p. (in Russian).

9. Gibson, A. (1923) Hydraulics and its Applications. New York, Van Nostrand Company. 813 p. (Russ. ed.: Gibson, A. (1934). Gidravlika i ee Prilozheniia. ?oscow, Leningrad: State Power Engineering Publishing House. 610 p.)

10. Frenkel, N. Z. (1956) Hydraulics. ?oscow, Leningrad, Gosenergoizdat. 456 p. (in Russian).