UDK 629.7:532.59:539.3
ATTENUATION OF THE COMPELLED FLUCTUATIONS AND HYDROSHOCK WAVES IN THE TURBULENT STREAM OF EXTENDED PATHS OF POWER SUPPLY SYSTEMS OF LIQUID ROCKET ENGINES
S. A. Barabanov [1], V. I. Biryukov [2]*
[1] JSC “Power automatics”9, Chuksin deadlock, Moscow, 127206, Russian Federation [2] Moscow aviation institute (national research university)4, Volokolamskoe shosse, GSP-3, Moscow, 125993, Russian Federation
Wave processes in pipeline systems are at the bottom of non-uniformity of the expenses submitted liquids through them. At opening or closing of regulating armature of a power supply system of liquid rocket engines there are single shock waves which are pressure indignations in a wide spectrum of frequencies and can lead to excitation of instability of working process in gas generators or combustion chambers. The work purpose is the experimental research of processes of attenuation of the compelled fluctuations and single hydroshock waves in turbulent streams poorly compressed a drop liquid in smooth hydraulic highways of round section. As process of attenuation of shock waves is swept up only in extended paths with the relation of length to diameter of the pipeline more than several thousand the methodology of carrying out of the given work has been constructed on excitation of hydroshock waves in the main transport system which is carrying out swapping hydrocarbonic combustible and registration of pressure by gauges, placed in regular intervals along a highway. At researches indignations with amplitude more than in 2 times of level of constant hydrodynamic noise were created. Single hydroshock waves were raised by carrying out the selection of liquid. Thus in reply to crane opening (the selection beginning) the wave pressure reduction, and on closing – a compression wave was generated. The carried out spectral analysis of a signal has shown that the basic part of a spectrum of hydrodynamic fluctuations is in a frequency range to 10 Hz. Higher frequencies generated by work of pump units, quickly fade. As a result of experiments approximation dependence of decrement of attenuation of single waves of compression and pressure reduction in the form of function from Reynolds's numbers has been received. At transitive modes of a current of a liquid from laminar to turbulent dynamic changes occur in a laminar layer and the indicator of attenuation of a shock wave aspires to a constant. On the basis of the made assumptions experimental points are approximated exponential by a kind curve . By results of the spent processing values for factors have been received and comparison of the settlement data with results of experiments is executed. The satisfactory consent of results of tests to modeling installation and extended highways is shown. The received experimental dependence describing attenuation of hydroshock waves in turbulent streams, is used at carrying out of engineering calculations of power supply systems of liquid rocket engines on chair “Rocket engines” at the Moscow aviation institute.
a hydroshock wave, a spectrum of frequencies, decrement of attenuation, a resonance, turbulence, Reynolds’s number.
References
- Glikman B. F. Avtomaticheskoe regulirovanie zhidkostnykh raketnykh dvigateley [Automatic control of liquid rocket engines]. Moscow, Mashinostroenie Publ., 1974, 296 p.
- Glikman B. F. Nestatsionarnye techeniya v pnevmogidravlicheskikh tsepyakh [Non-stationary currents in pneumatichydraulic chains]. Moscow, Mashinostroenie Publ., 1979, 253 p.
- Lamb G. Gidrodinamika [Hydrodynamics]. Moscow, Gostekhizdat Publ., 1947, 929 p.
- Pukhov V. A., Chucherov A. I. Stendovye ognevye ispytaniya ZhRD [Bench fire tests LPR]. Moscow, Mashinostroenie Publ., 1971, 543 p.
- Neustoychivost' goreniya v ZhRD [Liquid Propelland Rocket Combustion Instability]. Editor D. T. Xarrje, ass. edit. F. H. Reardon]. Moscow, Mir Publ., 1975, 870 p.
- Makhin V. A., Prisnyakov V. F., Belik N. P. Dinamika zhidkostnykh raketnykh dvigateley [Dynamics of liquid rocket engines]. Moscow, Mashinostroenie Publ., 1974, 833 p.
- Moshkin E. K. Nestatsionarnye rezhimy raboty ZhRD [Non-stationary operating modes LPR]. Moscow, Mashinostroenie Publ., 1970, 336 p.
- Biryukov V. I., Kozlov A. A. Vnutrikamernaya nizkochastotnaya neustoychivost' rabochego protsessa v drosseliruemykh ZhRD [Intrachamber low-frequency instability of working process in throttled LPR], Moscow, MAI-PRINT Publ., 2007, 384 p.
- Biryukov V. I., Mosolov S. V. Akustika gazovykh traktov zhidkostnykh raketnykh dvigateley [Acoustics of gas paths of liquid rocket engines], Moscow, Izd-vo MAI Publ., 2013, 164 p.
- Barbashov E. D., Glikman B. F., Kazakov A. A., Morozov S. A. [Experimental research of acoustic characteristics of a column of a liquid in landlocked pipes], Akusticheskiy zhurnal, 1996, Vol. 42, No.4, P. 478–488 (In Russ.).
- Belyaev E. N., Chervakov V. V. Matematicheskoe modelirovanie ZhRD [Mathematical modeling LPR], Moscow, MAI_PRINT Publ., 2009, 280 p.
- Zhukovskiy N. E. O gidravlicheskom udare v vodoprovodnykh trubakh [About hydraulic blow in water pipes]. M.–L., Gostekhizdat Publ., 1949, 103 p.
- Shlikhting G. Teoriya pogranichnogo sloya [The interface theory]. Moscow, Nauka Publ., 1974, 713 p.
- Charnyy I. A. Neustanovivsheesya dvizhenie real'noy zhidkosti v trubakh [Unsteady movement of a real liquid in pipes]. Moscow, Nedra Publ., 1975, P. 186–191.
- Liyv U. R. Teoreticheskie i eksperimental'nye osnovy rascheta napornogo uskorennogo dvizheniya zhidkosti v tsilindricheskikh trubakh. Avtoref. dis. d-ra tekhn. nauk. [Theoretical and experimental bases of calculation of the pressure head accelerated movement of a liquid in cylindrical pipes. Dr. techn. sci. diss. author's abstr.], Leningrad, 1983, 48 p. (In Russ.).
Barabanov Sergey Alexandrovich – postgraduate student, Moscow aviation institute (national research university), Project Director of LLC “Energoavtomatika”. E-mail: barabanov.sergey@gmail.com
Biruykov Vasiliy Ivanovich – Dr. Sc., Docent, professor of Moscow aviation institute (national research university). E-mail: aviatex@mail.ru
