含径向对流吸积盘的径向-环向不稳定性研究

The studies of the radial-azimuthal instability of accretion disk with advection

从流体力学方程组出发,用微扰法得出含径向对流吸积盘的径向-环向不稳定性的色散方程,并根据盘的不同结构研究了四种模的不稳定性质.着重研究了径向粘滞力对含径向对流吸积盘的径向-环向不稳定性的影响.结果表明:径向粘滞力对声模有较大的影响,但不改变粘滞模和热模的稳定性质.这一模型有利于解释银河系中黑洞候选体的QPO现象.

The radial azimuthal instability of accretion disk with advection is analysed.By using perturbation method,we get the dispersion equation.We study the instability of four kinds of modes according to the different structure of accretion disk.The effect of viscous force are discussed in detail.We find that the introduction of radial viscous force have no influence on stability of viscous and thermal modes,but more influence on the stability of acoustic modes.This model may be useful to explain the QPO phenomena in some systems,such as Galactic black hole candidates.