Papers by Arthur V Krasilnikov
33rd Plasmadynamics and Lasers Conference, 2002
The first test series of the external MHD generator model fed with the high frequency plasmatron ... more The first test series of the external MHD generator model fed with the high frequency plasmatron (HFP) are presented and analyzed. Before the test the diagnostics of the flow near the model surface is performed. The pressure, velocity, temperature, heat flux, electron concentration are measured or evaluated. To measure translational, vibrational and electron temperatures definition the special spectral apparatus is used. The values of temperatures are calculated using the experimental spectral intensity distributions across the plasma flow near the model. In all cases the rotational temperatures is assumed to be equal to translational one. For the electron concentration definition the Longmire probes is used . The external MHD generator model is a plate of size 250 x 400 mm with a number of electrodes on wind surface and an electromagnet system on under wind side. The model made of an insulating thermal protection material was installed at small angle of attack and streamlined by plasma flow exhausting through a flat nozzle of exit size 50 x 270 mm. The electromagnet system is a device for short operation time. The electric current is provided by a condenser battery discharge and the magnetic induction at the working surface of the model can reach ~0.4. Tesla and more. During the tests the external MHD generator electric parameters (voltage and current) are obtained and discussed. Preliminary gas flow in the discharge chamber and jet of the HFP is accompanied with numerous real gas processes (such as dissociation, ionization, chemical reactions, excitation of internal modes, energy translation between the particles of different kinds).
AIAA/CIRA 13th International Space Planes and Hypersonics Systems and Technologies Conference, 2005
The recently obtained experimental results on MHD interaction at modified flat plate model of sur... more The recently obtained experimental results on MHD interaction at modified flat plate model of surface MHD generator are presented and discussed. Practically the same models were tested in experiments at subsonic and supersonic facilities. The MHD interaction effects have been clearly observed and confirmed with fast flow visualization and measurements of the induced electrical potential at electrodes. The reasonable good correlation between sub-and hypersonic test results is found. 2D numerical simulation of the MHD interacting flow has demonstrated the rather satisfactory qualitatively agreement with experimental observation. One of the main conclusions at this stage of the study is that the near electrode phenomenology is far from the understanding and seems to be one of the most critical point in further development.
45th AIAA Aerospace Sciences Meeting and Exhibit, 2007
Experimental study of plasma MHD interaction in the working zone of a high-frequency plasmatron h... more Experimental study of plasma MHD interaction in the working zone of a high-frequency plasmatron has been carried out in at the operating regimes with power up to 200 kW and pressure 50-200 mbar. The plasma examination was conducted near a model representing a plane plate 0.25x0.25 m 2 size, which had blunted cooper nose. The model was tilted at 10 with respect to the flow. Inside the model a solenoid was settled, which produced pulsing magnetic field of 3 ms duration and up to 1 Tesla amplitude caused by 6 kA current generated by discharge of a capacitor battery. Subsonic plasma flow in the plasmatron inductor was initiated by a high-frequency 440 kHz voltage. Diameter of the plasma flow in the region of the model was 0.18 m. The spectral-zonal plasma investigation included simultaneous measurements of the plasma UV-images, time history of the plasma radiation intensity at the wavelength 246 nm and the plasma radiation spectrum in the region of 230-360 nm. Measurements in the UV region of spectrum offer great advantages in comparison with other spectral regions because impurity atomic lines (such as Na, K, Cu) interference, which is inevitable at the strong MHD impact producing intensive impurity lines in the visible spectral region, is minimized here; the air plasma UV radiation is very sensitive to temperature variation at the MHD interaction; ispectralzonal imagery allow very contrast observation of the plasma region interacting with pulsing magnetic field. Analysis of the spectra in experiments showed that at the moment of the magnetic field application ~4.8 ms a high temperature air glow was observed with no impurities contamination (for instance Cu, K). Well developed system of oxygen and nitrogen lines that have high excitation energies ~10-13 eV. Pares of lines having upper level excitation energy difference of 1 eV were selected for determination of temperature that ensured good accuracy of the measurements. The plasma temperature was determined from ratio of oxygen and nitrogen pares of lines. It was revealed that before the magnetic field is applied, the plasma temperature value is about 6900 and at the moment when the magnetic field is applied the plasma temperature value reaches a considerable value 10000 -11000 . The UV-images comparison of the model inside the plasma before the magnetic field switched on, at the time the magnetic field was on and after the field show apparent enhancement of the plasma emission intensity and increase of the plasma layer width in the snapshots at the moment when the magnetic field is applied.
43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005
ABSTRACT
41st Aerospace Sciences Meeting and Exhibit, 2003
44th AIAA Aerospace Sciences Meeting and Exhibit, 2006
The recently obtained experimental results on MHD interaction at modified flat plate model of sur... more The recently obtained experimental results on MHD interaction at modified flat plate model of surface MHD generator are presented and discussed. Practically the same models were tested in experiments at subsonic and supersonic facilities. The MHD interaction effects have been clearly observed and confirmed with fast flow visualization and measurements of the induced electrical potential at electrodes. The reasonable good correlation between sub-and hypersonic test results is found. 2D numerical simulation of the MHD interacting flow has demonstrated the rather satisfactory qualitatively agreement with experimental observation. One of the main conclusions at this stage of the study is that the near electrode phenomenology is far from the understanding and seems to be one of the most critical point in further development.
42nd AIAA Aerospace Sciences Meeting and Exhibit, 2004
The Magneto-Hydro-Dynamic (MHD) effect study at High Frequency Plasmatron (HFP ) in ~ 1 MW power ... more The Magneto-Hydro-Dynamic (MHD) effect study at High Frequency Plasmatron (HFP ) in ~ 1 MW power is described. The HFP simulates the real flight range of pressure, stagnation enthalpy and flight duration of a Hypersonic Piloted Aircraft (HPA) at altitude from 50 to 80 km. The ...
A modernization of TsNIIMash Magneto-Hydro-Dynamic (MHD) power facility 1,2 , simulating superson... more A modernization of TsNIIMash Magneto-Hydro-Dynamic (MHD) power facility 1,2 , simulating supersonic hydrogen/oxygen combustion, is described. This facility consists of a high-pressure chamber (HPC), supersonic nozzle, magnet, MHD generator, diffuser and exhaust system. To increase the electron concentration a seed injector system is used. The goal of the facility is the physical demonstration of the MHD electrical power generation under conditions simulating those for on-board multi-megawatt power generating system. For the successful solution of this problem it is necessary to advance and study electro physical parameters in a MHD generator channel 3-5 .
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Papers by Arthur V Krasilnikov