| Autor: |
Vladimir S. Sukhomlinov, Evgeniy Sheikin |
| Rok vydání: |
2006 |
| Předmět: |
|
| Zdroj: |
44th AIAA Aerospace Sciences Meeting and Exhibit. |
| DOI: |
10.2514/6.2006-1369 |
| Popis: |
The analytical and Monte Carlo methods for calculation of the spatial distribution of the energy deposited by electron beam into a flow are developed both for uniform and nonuniform flows. Influence of the electric field generated by uncompensated space charge on the e-beam propagation is analyzed. The need to develop the self-consistent approach for describing the flow control in using the e-beam energy deposition is demonstrated. I. Introduction. Nowadays intense interest is shown in using plasma and MHD systems to control a flow. Much attention is given to nonequilibrium MHD generator which allows one to control a flow in conditions when natural conductivity of the flow is negligible to produce noticeable MHD effect. In all cases it is necessary to deposit energy into a flow both for creation of plasma and maintenance of nonequilibrium conductivity. E-beam is regarded as a possible method of energy deposition into a flow for creation of plasma and providing the flow control. In MHD applications e-beam is considered as a perspective means of creation of nonequilibrium conductivity of flow 1 . The range of e-beam penetration in the medium depends significantly on the initial energy of electrons in the e-beam T0. So, by changing the initial energy of e-beam one can provide the energy deposition in the flow both in the vast area at high values of T0 and locally near the surface the e-beam is emerged from at low values of T0. Now Monte-Carlo methods are usually used for numerical computations of spatial distribution of energy deposited by e-beam passing through a substance 2 . The Monte-Carlo methods are oriented on well-defined conditions. But it is evident that in result of flow control the flow parameters will be modified, thus conditions at which the energy is deposited into the flow are differed from initial conditions. These circumstances are typical not only for e-beam, but for any means of creation of plasma which is supposed to be used to control a flow. So to investigate a flow control that is provided by the plasma techniques, it is necessary to consider a self-consistent approach which takes into account modification of the flow parameters due to the plasma control. As regards the ebeam the self-consistent approach can be realized only in using a very fast specialized Monte Carlo code which can be unified with gas-dynamics equations or in using reliable analytical description of e-beam passage through a flow. Nowadays analytical approaches which are suitable for description of e-beam propagation in gases in process of energy degradation from its initial energy (1-100 keV) down to the final energy (several eV) are absent. This paper is aimed to develop the effective methods for calculation of spatial distribution of energy deposited by e-beam in a flow control applications. The Boltzmann kinetic equation for fast particles, moving in a gas of slow molecules 3 will be used for development of analytical approaches in describing the e-beam propagation in homogeneous and inhomogeneous flows |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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