Final answer:
The main purpose of a hydraulic accumulator is to store and release hydraulic energy, which is used to perform mechanical work when needed.
Step-by-step explanation:
The main purpose of a hydraulic accumulator is to store and release hydraulic energy. It acts as a reservoir, which stores hydraulic fluid under pressure. This stored energy can be released to perform mechanical work when needed.
For example, in a hydraulic jack used by auto mechanics to lift heavy loads, the hydraulic accumulator stores energy in the form of compressed hydraulic fluid. When the jack is operated, the hydraulic fluid is released from the accumulator, creating a force that is used to lift the automobile.
Hydraulic accumulators are also commonly used in power brakes and other hydraulic systems where additional energy may be required at certain times.