МЕЖДУНАРОДНОЕ СОТРУДНИЧЕСТВО
J i n g y i C h e n
(Institute of Engineering Thermophysics, Chinese Academy
of Sciences, Beijing 100080, China)
FLOW INSTABILITY AND ITS CONTROL
IN COMPRESSION SYSTEMS
This paper reviews the development in the research of flow instability
and its control over the recent ten or more years. This development was
largely stimulated by the novel idea of active control of the aerodynamic
instability in compressors. Three topics are covered in the paper, which
appeared as the major themes towards the goal of stability enhancement.
The first topic is the pre-stall behavior of rotating stall, which plays a
vital role in designing the control scheme and discovering the convenient
route to find the causal factors of flow disturbances potentially leading
to stall. The second topic is the mechanism of blade passage flow
during stall and its inception, which is the basic knowledge needed to
manipulate the blade design for the stability improvement and eventually
to predict the unsteady performance of the compressor system. The third
topic is the recent trend of the control strategy based on the learning
of active vs. passive methods. To introduce to the discussion of these
topics, a brief description of the history of the recent development is
given at the beginning of the paper. In discussing each topic, future
works are also highlighted to enhance the further development of this
long-standing problem in turbomachinery research and application.
Introduction.
The phenomenon of flow instability in the compression system,
typically rotating stall and surge, is a long-standing problem of concern for
turbomachinery research and application. Rotating stall is typified by one or more
stall cells of degraded blade flows traveling around the compressor annulus, while
surge is a mean flow oscillation that often involves reversed flow. Both of them
appear as the stability limiting factors to the compressor operation because of the
consequences invoked by them in deteriorating the compressor performance and
in the danger of mechanical failure. Numerous research and application work have
spanned over decades, with its practical aim being the stall margin provision and
the mechanical excitation alleviation. In recent years, however, revitalized efforts
can be witnessed primarily due to the new “smart engine” concept [1] and its
successful implementation for active control of aerodynamic instabilities. These
research efforts have led to a number of important results and innovative ideas
have been continuously updated. It is this new development that the present paper
is trying to give a review through discussing some aspects of its successes and
lessons.
Several review articles were already available, two appeared in 1998 [2, 3]
and the other two in 2000 [4, 5]. Among them the one by Greitzer [2] is very
specific in describing the methodological aspects of this research such as the
1
Статья публикуется в авторской редакции.
ISSN 0236-3941. Вестник МГТУ им. Н.Э. Баумана. Сер. “Машиностроение”. 2006. № 2 113
