每年出版 4 期
ISSN 打印: 1093-3611
ISSN 在线: 1940-4360
Indexed in
CONSTANT-VOLUME FOUR-LINED GAS-DISTRIBUTING COMBUSTION CHAMBER OF SPOOL-TYPE CONFIGURATION
摘要
A constant-volume high-performance spool-type combustion chamber has been designed to operate
in advanced propulsion systems where pulsating operating processes occur. The chamber can be
applied in pulsejet engines as a detonation initiator of detonation engines, gas-dynamic lasers, and
MHD generators.
The article is focused on the development of a low-pressure fuel-supply system and a four-lined
intermittent combustion chamber. When testing a diesel fuel-supply system, the functional capability
of a single-lined combustion chamber reached a vibration frequency of 100 Hz. The value of
the compression ratio during combustion was λ = 7. In order to ensure a continued improvement
of speed rate and weight dimension characteristics of the combustion chamber, it is necessary to
increase the operating vibration frequency (spool speed rate n). The analysis indicated that with
n ≥ 4000 rpm, the delay time of the air-fuel mixture ignition by the chamber wall is sufficient for
complete overlapping of the spool-valve port by the ignition time, i.e., the flame-out at the chamber
input is impossible. The objective to raise the speed rate was therefore achieved by using a simple
low-pressure (0.4−0.8 MPa) continuous system of fuel supply to the inlet nozzle. During the tests
carried out the designed fuel-supply system along with swirl-type nozzles provided a stable chamber
operation up to 190 Hz. Thus, the maximum combustion temperature Tz exceeded 2000 K,
and the engine designed on the single-lined chamber can match small-sized turbojet engines by the
level of face thrust.