(a) In order to prevent the influence of no-load of hydraulic pump on the
“cross-connection” of generator overrunning, a loading valve (or
repression valve) is set at the outlet of hydraulic pump to regulate and
isolate. By using pressure feedback from pump outlet, the opening of
loading valve is reduced, the flow into hydraulic system is blocked, and
the pump is loaded by throttling and boosting to avoid no-load turbine
running, so as to ensure that the speed, frequency, and voltage of the
generator do not exceed the limit.
In order to prevent the influence of the hydraulic servo system of the seeker antenna
on the “intersection” of the servo speed when the pilot hydraulic steering gear
operates at a large flow rate, a current limiting valve is set at the intersection of the
hydraulic system and the branch to regulate and isolate. Negative feedback of
pressure difference is used to reduce the opening of current limiting valve, to limit
the flow into the rudder, and to ensure the follow-up speed of the seeker antenna so
as to search or track the target instantaneously and quickly.
(3) Liquid Unit Agent SA-2 and Application in Sea Javelin
SA-2 series liquid unit agents (isopropyl nitrate), as a special auxiliary energy
for liquid rocket engine propellant delivery system (requiring low pressure and
large flow), provide propellant from the storage tank to the combustion
chamber of liquid rocket engine by turbine, which is driven by gas generated by
decomposition of liquid gas generator, coaxial driven oxidizer pump and burner
pump. Turbine is started by gunpowder starter, which is a small, short-term
solid charge gas generator.
The gas generated by the decomposition of liquid unit agent (IPN) of Sea
Javelin is used as primary energy for both systems, as shown in Fig. 9.21. One
way goes to the hydraulic steering system of the autopilot, and another way
goes to boost the ramjet fuel tank through the decompressor. Its main supplier
is the former. The gas motor hydraulic pump in the figure supplies oil to the
hydraulic steering gear (requiring high pressure and small flow rate). The linear
reciprocating motor pump is essentially a gas pressurized hydraulic accumulator with stroke as cycle, controlled by gas-hydraulic linkage distribution
valve, gas pressure compensation, continuous operation, and variable flow
output. It has a series of advantages, such as high efficiency, fast response
(small inertia, good acceleration), reliability (no rotating parts), and short
starting time. In addition, the differential piston type oil reservoir is used not
only as boosting oil supply before pump of gas motor hydraulic pump to
prevent cavitation erosion, but also as volume compensation and temperature
compensation for system leakage. In essence, it is a self-boosting oil tank with
double compensation ability. The auxiliary energy system adopts the common
source system which is common for the control actuation system and the power
transmission system. Its main characteristics are
9.1 Electro-Hydraulic Servo Control Technology of Aircraft Gas Turbine Pump
103
“cross-connection” of generator overrunning, a loading valve (or
repression valve) is set at the outlet of hydraulic pump to regulate and
isolate. By using pressure feedback from pump outlet, the opening of
loading valve is reduced, the flow into hydraulic system is blocked, and
the pump is loaded by throttling and boosting to avoid no-load turbine
running, so as to ensure that the speed, frequency, and voltage of the
generator do not exceed the limit.
In order to prevent the influence of the hydraulic servo system of the seeker antenna
on the “intersection” of the servo speed when the pilot hydraulic steering gear
operates at a large flow rate, a current limiting valve is set at the intersection of the
hydraulic system and the branch to regulate and isolate. Negative feedback of
pressure difference is used to reduce the opening of current limiting valve, to limit
the flow into the rudder, and to ensure the follow-up speed of the seeker antenna so
as to search or track the target instantaneously and quickly.
(3) Liquid Unit Agent SA-2 and Application in Sea Javelin
SA-2 series liquid unit agents (isopropyl nitrate), as a special auxiliary energy
for liquid rocket engine propellant delivery system (requiring low pressure and
large flow), provide propellant from the storage tank to the combustion
chamber of liquid rocket engine by turbine, which is driven by gas generated by
decomposition of liquid gas generator, coaxial driven oxidizer pump and burner
pump. Turbine is started by gunpowder starter, which is a small, short-term
solid charge gas generator.
The gas generated by the decomposition of liquid unit agent (IPN) of Sea
Javelin is used as primary energy for both systems, as shown in Fig. 9.21. One
way goes to the hydraulic steering system of the autopilot, and another way
goes to boost the ramjet fuel tank through the decompressor. Its main supplier
is the former. The gas motor hydraulic pump in the figure supplies oil to the
hydraulic steering gear (requiring high pressure and small flow rate). The linear
reciprocating motor pump is essentially a gas pressurized hydraulic accumulator with stroke as cycle, controlled by gas-hydraulic linkage distribution
valve, gas pressure compensation, continuous operation, and variable flow
output. It has a series of advantages, such as high efficiency, fast response
(small inertia, good acceleration), reliability (no rotating parts), and short
starting time. In addition, the differential piston type oil reservoir is used not
only as boosting oil supply before pump of gas motor hydraulic pump to
prevent cavitation erosion, but also as volume compensation and temperature
compensation for system leakage. In essence, it is a self-boosting oil tank with
double compensation ability. The auxiliary energy system adopts the common
source system which is common for the control actuation system and the power
transmission system. Its main characteristics are
9.1 Electro-Hydraulic Servo Control Technology of Aircraft Gas Turbine Pump
103