operation. It has the advantages of high efficiency, fast response (small inertia, good
acceleration), reliability (no high-speed rotating parts), and short starting time.
When working, the gas produced by the decomposition of liquid unit agent drives
motor pump feeding oil to the hydraulic system. The flow rate of liquid unit agent is
automatically adjusted by the flow control valve through gas pressure feedback. Its
advantages are variable power output, output power matching load power. It is
suitable for hydraulic servo mechanism with smooth trajectory, low load cycle
percentage and average power, and long working time. The disadvantages are
complex composition, inconvenient use, toxicity of liquid unit agent, and high cost
of single use.
It should be pointed out that the gas motor pump scheme is rare even in foreign
countries, because the application of this scheme is conditional. These conditions
include: 1. long working time; 2. smooth trajectory, minimum load cycle percentage, and average power; 3. gas generated by liquid unit agent can be comprehensively utilized in the auxiliary energy of the whole missile; 4. mature
technology and experience.
9.1.6.2 Application of Gas Turbine Pump
Gas turbine pump has the advantages of simple composition, convenient use, and
high reliability, and has been widely used at home and abroad. The gas turbine
pumps of tactical air defense missiles can be divided into two categories: one is
with accumulator and gas booster tank, and the gas part does not have gas relief
valve (Fig. 9.31). The other is with gas relief valve, hydraulic loading valve,
flow-limiting valve, and self-pressurized tank (Fig. 9.32).
Figure 9.31 shows a gas turbine pump system with a gas nozzle and a gas
booster tank. Its advantage is a simple composition. The pressure of the hydraulic
system is constant after the accumulator is introduced. It can absorb the hydraulic
impact of the system and stabilize the pressure fluctuation of the pump, and also
provide a larger instantaneous supplementary flow to the system. When launching,
the electric explosion valve is used to control the pressurization of small cylinders
to the tank, which solves the problem of gas and oil leakage in the tank under
long-term storage conditions. Its disadvantage is that it is inconvenient to use and
needs to supply gas to accumulator and small cylinder. Before launching in
high-temperature environment, it is necessary to install a suitable vent nozzle to
relieve the overflow pressure of the gas generator, so as to increase the content and
time of service operation. Because there is no gas relief valve and hydraulic loading
valve, when the servo valve is not loaded, the turbopump may have a short time
overturn. The system is suitable for hydraulic system with a high requirement of
constant pressure, high requirement of instantaneous rudder deflection speed, air
source equipment in technical position, good service condition, and certain overturning ability of turbopump. A vertical launch flight tester in China adopts a gas
turbine pump with accumulator.
9.1 Electro-Hydraulic Servo Control Technology of Aircraft Gas Turbine Pump
111
acceleration), reliability (no high-speed rotating parts), and short starting time.
When working, the gas produced by the decomposition of liquid unit agent drives
motor pump feeding oil to the hydraulic system. The flow rate of liquid unit agent is
automatically adjusted by the flow control valve through gas pressure feedback. Its
advantages are variable power output, output power matching load power. It is
suitable for hydraulic servo mechanism with smooth trajectory, low load cycle
percentage and average power, and long working time. The disadvantages are
complex composition, inconvenient use, toxicity of liquid unit agent, and high cost
of single use.
It should be pointed out that the gas motor pump scheme is rare even in foreign
countries, because the application of this scheme is conditional. These conditions
include: 1. long working time; 2. smooth trajectory, minimum load cycle percentage, and average power; 3. gas generated by liquid unit agent can be comprehensively utilized in the auxiliary energy of the whole missile; 4. mature
technology and experience.
9.1.6.2 Application of Gas Turbine Pump
Gas turbine pump has the advantages of simple composition, convenient use, and
high reliability, and has been widely used at home and abroad. The gas turbine
pumps of tactical air defense missiles can be divided into two categories: one is
with accumulator and gas booster tank, and the gas part does not have gas relief
valve (Fig. 9.31). The other is with gas relief valve, hydraulic loading valve,
flow-limiting valve, and self-pressurized tank (Fig. 9.32).
Figure 9.31 shows a gas turbine pump system with a gas nozzle and a gas
booster tank. Its advantage is a simple composition. The pressure of the hydraulic
system is constant after the accumulator is introduced. It can absorb the hydraulic
impact of the system and stabilize the pressure fluctuation of the pump, and also
provide a larger instantaneous supplementary flow to the system. When launching,
the electric explosion valve is used to control the pressurization of small cylinders
to the tank, which solves the problem of gas and oil leakage in the tank under
long-term storage conditions. Its disadvantage is that it is inconvenient to use and
needs to supply gas to accumulator and small cylinder. Before launching in
high-temperature environment, it is necessary to install a suitable vent nozzle to
relieve the overflow pressure of the gas generator, so as to increase the content and
time of service operation. Because there is no gas relief valve and hydraulic loading
valve, when the servo valve is not loaded, the turbopump may have a short time
overturn. The system is suitable for hydraulic system with a high requirement of
constant pressure, high requirement of instantaneous rudder deflection speed, air
source equipment in technical position, good service condition, and certain overturning ability of turbopump. A vertical launch flight tester in China adopts a gas
turbine pump with accumulator.
9.1 Electro-Hydraulic Servo Control Technology of Aircraft Gas Turbine Pump
111