文档介绍：Numerical Simulation of Flow Fields in Diaphragm Gland
of Steam Turbine
Zhang Hongli
Shenyang Institute of Engineering,
Sheng Wei
Shenyang Institute of Engineering,
Wang Shuqun
Shenyang Institute of Engineering,
Abstract
The leakage characteristics of the bending-teeth gland, which may be helpful for the fast start and fast stop
of the steam turbine, was discussed in this paper by using software. pared the flow
fields in straight-teeth gland and bending-teeth gland, the methods for the bending-teeth gland to decrease
the steam leakage was proposed. The results show that, although the leakage of the bending-teeth gland is
larger than that of the straight-teeth gland at the same number of teeth and other conditions, this will be
changed if the number of the teeth increases or the leaking gap decreases for the bending-teeth gland.
Introduction
In the flow part of the steam turbine, with the gap between the static stator and rotating rotor, there is
leakage of steam or air, which will decrease the efficiency of the steam turbine. In order to decrease this
leakage, different kinds of seals are installed at the diaphragm, the top of the blade and the shaft sleeve.
Since the friction between the stator and rotor for their different speed of thermal expansion and shrinkage
caused by using the straight