Dynamics of a partially cavitating underwater vehicle

Semenenko, V. N.; Naumova, O.

doi:10.15407/jha2018.01.070

Cited by 3 publications

(8 citation statements)

References 3 publications

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“…3) the equation of the mass of gas in the cavity balance for the ventilated cavity (see [6,11]); 4) the relations for hydrodynamic forces acting on the inclined cavitator (see [4]); 5) the relations for hydrodynamic forces acting when the vehicle body interacts with the cavity walls (planing or ricochet, see [9,14]); 6) the relations for hydrodynamic forces acting on the cavity-piercing fns (see [5,12]).…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The cavitator cone angle n β may be varied from 30° to 180°(disk). Table 2 shows values of the diameters D n (4) and the total drag nx F (11) of the cone cavitators for a number of the cone angles n β .…”

Section: Calculation Model and Calculation Parametersmentioning

confidence: 99%

“…The steady longitudinal motion of the SC-vehicle is called the balanced one, if sums of all the forces acting and their moments relative to the vehicle mass center are equal to zero. To determine the balanced values of parameters, one applies an iterative numerical algorithm developed in our work [11].…”

Section: Balancing the Sc-vehicles With Cone Cavitatorsmentioning

confidence: 99%

“…When n β is varied, the SC-vehicle may be flown around in one of two cavitation regimes. In the partial cavitation regime, the vehicle drag is a sum of the cavitator drag nx F and the skin friction drag of the wetted part of the body bx F (see [10,11]). In the regime with free closure of a cavity, the SC-vehicle drag is equal to nx F .…”

Section: Cavity Control By the Cavitator Cone Angle Regulationmentioning

confidence: 99%

“…to perform a computer simulation. With the help of computer simulation, the problem of the SC-vehicle speeding-up (see [10,11]), various methods of control of the SC-vehicle motion (see [4,12]), as well as peculiarities of the SC-vehicle maneuvering in depth and on course (see [13,14]) were investigated.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dynamics of supercavitating vehicles with cone cavitators

Semenenko

Moroz

Kochin

et al. 2022

Mech. Adv. Technol.

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The work is devoted to theoretical and experimental investigations of dynamics of high-speed underwater supercavitating vehicles with cone cavitators. The cone cavitators are considered as operating controls of the supercavitating vehicle motion. The mathematical model of a “slender” unsteady cavity based on the G.V.Logvinovich principle of independence of the cavity section expansion is used. Experimental studies of the rotary cone cavitators were carried out at the high-speed experimental tank of the Institute of Hydromechanics of the NAS of Ukraine. Based on test results, the approximate dependences of both the drag coefficient and the lift coefficient of an inclined cone cavitator on the rotary angle in a wide range of cone angles are proposed. The range of cone angles is determined when the cone cavitators are the more effective operating controls in comparison with equivalent disk cavitator. With the help of computer simulation, a number of problems of dynamics of the supercavitating vehicle with cone cavitators were investigated: balancing the vehicle, the motion stabilization, maneuvering the vehicle, the cavity control. For the first time, experimental verification of the mathematical model of the supercavitating vehicle dynamics “as a whole” was performed by testing the model with cone cavitators and cavity-piercing fins with a degree of freedom in pitch.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Calculation Model and Calculation Parametersmentioning

confidence: 99%

Section: Balancing the Sc-vehicles With Cone Cavitatorsmentioning

confidence: 99%

Section: Cavity Control By the Cavitator Cone Angle Regulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamics of supercavitating vehicles with cone cavitators

Semenenko

Moroz

Kochin

et al. 2022

Mech. Adv. Technol.

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Some ways of hydrodynamic fin application for underwater supercavitating vehicles

Semenenko¹,

Naumova²

2019

Gidrodin. akust.

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The paper deals with considering the two non-traditional ways of application of hydrodynamic fins for high-speed underwater supercavitating vehicles. The techniques for active roll stabilization and course control of the moving supercavitating vehicle are developed that use the regulation of the roll angle by means of both the special roll fin, and the automatic error-closing control system. The examples of a computer simulation of the course of maneuvering of the supercavitating vehicle controlled with the vertical hydrodynamic fins having zero roll angle stabilization are given along with the cases of the roll angle regulation. A method for determining the equilibrium motion parameters (balancing) of the supercavitating vehicle is developed for the case when a pair of identical horizontal cavity-piercing fins is used for complete or partial compensation of the vehicle's weight. The examples of a computer simulation of the motion of the supercavitating vehicle with horizontal fins in both the planing avoidance mode, and the combined mode are presented. It is shown that the steady-state longitudinal motion of the balanced supercavitating vehicle in the planing avoidance mode is stable "in the small", in contrast to its motion with planing in the cavity. It is found that, the horizontal fins in the combined motion mode can play a damping role suppressing the supercavitating vehicle motion instability "in the small", however, after a long time interval, the motion loses the global stability. The computer simulation suggests that the activation of the automatic depth stabilization makes the supercavitating vehicle motion stable in general in all the examined cases. Also it is revealed that course maneuverability of the supercavitating vehicle controlled with the vertical fins is maximal when starting the balancing in planing avoidance mode, but it deteriorates dramatically when starting the balancing in the combined mode.

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Formation and development of ventilated supercavity past the disk–cavitator in accelerated motion

Naumova,

Moroz,

Kochin

et al. 2023

Mech. Adv. Technol.

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The work is devoted to both the experimental studies and the computer simulation of the process of formation and development of a ventilated supercavity past the disk-cavitator in accelerated motion from the state of rest to the steady velocity. A series of experiments were carried out in the high-speed experimental tank at the Institute of Hydromechanics of the National Academy of Sciences of Ukraine for various values of the air-supply rate into the cavity. It has been established that the portion type of air-loss from the cavity is always preserved in the case of horizontal accelerated motion, while the air-loss by vortex tubes is always realized in the case of steady motion with the same velocity. In this case, shape of the cross sections of the unsteady cavity is close to circular one along the whole cavity length and at all stages of acceleration. To describe this process, a modified mathematical model is proposed that is based on the G.V.Logvinovich principle of independence of the cavity section expansion. An analysis of the influence of both the immersion depth and the air-supply rate on the process of development of a ventilated supercavity during acceleration has been performed by the way of computer simulation.

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Dynamics of a partially cavitating underwater vehicle

Cited by 3 publications

References 3 publications

Dynamics of supercavitating vehicles with cone cavitators

Dynamics of supercavitating vehicles with cone cavitators

Some ways of hydrodynamic fin application for underwater supercavitating vehicles

Formation and development of ventilated supercavity past the disk–cavitator in accelerated motion

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