TAILIEUCHUNG - Aeronautics and Astronautics Part 3

Tham khảo tài liệu 'aeronautics and astronautics part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Nonequilibrium Plasma Aerodynamics 69 When increasing the discharge current and magnetic induction the magnitude of the signal of the heat sensor varies differently when the ring electrode is positive the mean magnitude of the signal increases and at the negative polarity of the ring electrode the signal decreases Figure 19 b . Another series of experiments at the Ioffe Physical Technical Institute have been conducted using a shock tunnel Figure 20 operating with rare gases krypton xenon and argon to produce an ionized gas flow Bobashev et al 2006 . Fig. 20. Scheme of MHD channel with electrodes Bobashev et al 2006 . Figures are numbers of electrodes. U is flow velocity B is magnetic field I is current. The experiments shown in Figure 21 were carried out in Xe. In this case the magnetic field influence on a change in the Mach number when flow enters into the diffuser should be predominated one at B T. Fig. 21. Schlieren pictures of the flow in the case I II and III left to right . a V 110 V B 0 b V 110 V B Bobashev et al 2006 . In Figure 21 showed are the distinguished region of the diffuser functioning as the Faraday channel with the sectioned electrodes I - a whole diffuser the electrodes from 3rd to 7th pairs 70 Aeronautics and Astronautics functioning II - a region of the diffuser the inlet section excluded a current goes via 4-7th pairs of the electrodes III - the inlet section A current goes only via 3rd pair of the electrodes. All the electrodes are supplied with an equal voltage V 110V the experiment was carried out at B T. In Figure 21 showed are the Schlieren images of a flow obtained at the different commutations of a current. Fig. 22. Examples of variations in shock-wave configurations under the action of electric and magnetic fields. a deceleration regime b acceleration regime Bobashev et al 2006 . Experiments shown in Figure 21 revealed a strong effect of Joule heating Bobashev et al 2006 . The aim of experiment demonstrated in Figure 22

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