engine surge protection systems
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engine surge protection systems

engine surge protection systems

 

 

Appointment engine surge protection systems - to prevent violations GDU compressor and the engine is running at a loss GDU. protection systems are divided into two types:

(1) short-term stability margin increase systems (SKPZU) CS;

(2) systems for removing the engine from the mode of loss of GDU (surge, rotational stall) and restoration of the original mode (SVR).

Protection systems must be effective in all operating conditions J1A: at various altitudes and flight speeds, changing atmospheric conditions, vibration loads, and other evolutions J1A.

They have a light and / or audible alarm in the cockpit of the loss of the CDB and alarm malfunctions.

transient increase in inventories stability systems are designed to prevent violations of CDB engine under the influence of time, projected, occasionally emerging factors. These factors include a short-term increase in non-uniformity of flow and fluctuations in the evolution of J1A, effects of thermal perturbations, shocks etc.

Systems of this type are divided into two groups:

(1) included in situations preceding the appearance of predicted disturbances;

(2) triggered only when the intensity of disturbances exceeds a given critical level.

Systems of the first group are driven by the crew team J1A, and the second - on the signals generated by special sensors. In systems of the second group can be used detectors are designed to detect certain situations, such as exceeding a predetermined level of pressure fluctuations at the inlet of the engine, to achieve the critical angle of attack, exceeds the maximum deviation of the aircraft control surfaces and other.

As the controlling factors for the increase of short-term stability of stocks used SU-speed controls air intake, turn the blades on the compressor bypass air from the compressor flow path, a short-term reduction in fuel consumption in the main combustion chamber, reducing fuel consumption at the FCC, change the nozzle area.

Speed ​​and response time SKPZU synchronized with the duration of action of the perturbation. The typical length of the main operations is as follows:

- the time between bringing the system to a state of readiness and the beginning of the impact of disturbances on the engine (<0,25 s);

- the recovery time of the initial mode after reaching the mode with the maximum reserve of the GDU should not exceed by more than 1 s the time of injectivity from this reduced mode to the initial mode;

- the response time of the controls is no more than 0,2 s (0,8 s for the jet nozzle flaps) from the moment the crew is turned on (for systems of the first group) or from the moment the command is received from the signaling device (for systems of the second group).

 

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