Critical Submarine Technologies
Three most important technology in next generation submarines will be AIP(Air Independent Propulsion), Lithium Ion batteries and Pump jet technology. While AIP and Lithium-Ion batteries improves the endurance and improve the ability to stay under water for long time, the Pump jet technology improves the submarine’s propulsion speed and at the same time make it quieter and stealthier. The Pump jet Technology is mainly used in Nuclear powered submarines; however, they can also be used in conventional submarines. In today’s video we are going to talk about the Pump jet technologies as we have already made a detailed video on AIP and Lithium-Ion batteries. In case you have missed, please check the description section.
How does Pump jet work?
First the pump jet intakes water from the bottom of the hull which is further accelerated to produce uniform and high velocity jet stream. The jet stream exists from a steering nozzle which converts the energy of jet stream into a powerful forward thrust. The water jet and hydraulics are powered by a marine engine.
Pump-Jet propulsion system creates a jet of water to power a submarine forward. A Pump-Jet or a hydro jet produces less cavitation, which is the stream of bubbles or voids created by traditional propellers. Less cavitation means an even lower acoustic signature for the sub.
Pump Jet vs Conventional Propeller
With this kind of propulsion technology, there is no need to reverse the propeller unlike conventional propeller for backward motion or to stop it. When you compare the Pump jet propellers with conventional one, they are much faster and quieter, however at slow speed conventional propellers are more silent. This is the reason its preferred for heavy Nuclear attack submarines which needs more speed and power.
Project 75 Alpha
Under Project 75 alpha, the Indian Navy aims to procure new nuclear-powered attack submarines (SSN). The Government of India had approved the construction of six such submarines in February 2015. These will be designed by the Navy's in-house Directorate of Naval Design and built in India at the Shipbuilding Centre at Visakhapatnam. The construction is expected to start on 2023-24 while the first submarine is expected to enter service in 2032. These submarines are going to be next generation submarine with miniaturized pressure water reactor, hull from Mishra Dhatu Nigam and pump jet propulsion from DRDO.
DRDO’s Pump jet Propulsion technology
DRDO has already started working on the Pump Jet technology for Submarines which requires two important modules. First is the Marine engine and the second one is the pump jet. If you look at the USA Virginia class Submarine, it is powered by one nuclear reactor of 210 MW, two steam turbines of 30 MW and one primary and one secondary pump-jet propulsor motor. This propulsion helps to drive the submarine of 11,000t at a speed of 25knots or 46kmph. DRDO is also working on a pump jet propulsion which will have electrical engine motor that can generate the power of 525KW. DRDO is using the learning from the pump jet technology used in torpedoes to develop this prototype. This prototype will be scalable to massive 35MW of power. DRDO is planning to develop 1 for protype, 1 for qualification tests and 2 for actual evaluation and usage. It is driving this project via its Technological Development fund which can be collaboration of public or private firms together with foreign firms not having stake more than 49%. BHEL also has experience in developing & deploying 20MW motors. Going via the progress being made in this area, the pump jet propulsion can be easily developed indigenously. However, there is more to the Nuclear attack submarines and its related to its miniaturized nuclear reactor which we will discuss in detail in our next video.
==========WHOMSOEVER IT MAY CONCERN=============
Most of the pictures clip or BGM included in the Video
Belongs to their Respected Owners and we do not claim rights.
We are using them under following act:
=================DISCLAIMER=======================
UNDER SECTION 107 OF THE COPYRIGHT ACT 1976, ALLOWANCE IS MADE FOR "FAIR USE" FOR PURPOSES SUCH AS CRITICISM,
COMMENT, NEWS REPORTING, TEACHING, SCHOLARSHIP, AND RESEARCH. FAIR USE IS A USE PERMITTED BY COPYRIGHT STATUTE THAT MIGHT
OTHERWISE BE INFRINGING. NON-PROFIT, EDUCATIONAL OR PERSONAL USE TIPS THE BALANCE IN FAVOR OF FAIR USE.
Follow us on social media:
[ Ссылка ]
[ Ссылка ]
[ Ссылка ]
==============THANKS FOR WATCHING!================
PLEASE LIKE SHARE & SUBSCRIBE: "INDIAN DEFENSE ANALYSIS"
Music: Eternal Garden - Dan Henig
