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| Rolls-Royce WR-21 | |
|---|---|
| Name | WR-21 |
| Manufacturer | Rolls-Royce |
| Type | Marine gas turbine with intercooler-recuperator |
| First run | 1990s |
| Power output | 25–36 MW (combined) |
| Fuel | Marine diesel, JP-5, F-76 |
Rolls-Royce WR-21 is a marine gas turbine system developed by Rolls-Royce in the 1990s for high-performance naval propulsion, notable for its novel intercooler-recuperator cycle and intended use in frigates and destroyers. The program involved collaboration with industrial partners and was deployed on platforms built by BAE Systems, VT Group, and ThyssenKrupp Marine Systems, among others. The design aimed to provide improved thermal efficiency and reduced fuel consumption compared with conventional marine gas turbines used by navies such as the Royal Navy and the United States Navy.
The WR-21 was conceived within Rolls-Royce engineering programs influenced by work at Derby, Derbyshire and Bristol facilities and benefitted from research alliances with Siemens and academic partners such as the University of Cambridge and the University of Oxford. Initial concept studies referenced advances from projects at General Electric and Allison Engine Company as well as lessons from MTU Friedrichshafen and Wärtsilä developments. Funding and procurement decisions involved stakeholders including the Ministry of Defence (United Kingdom), United States Department of Defense, and prime contractors like BAE Systems Submarines and Vosper Thornycroft.
Prototypes were tested at Rolls-Royce testbeds and at facilities in Ansty and on sea trials coordinated with shipyards such as BAE Systems Maritime and VT Shipbuilding. The program schedule intersected with procurement programs including the Type 45 destroyer and export proposals to navies like the Royal Australian Navy and the United States Coast Guard.
The WR-21 combined a Rolls-Royce RB211-derived gas generator architecture with an innovative intercooler-recuperator module developed with partners including Siemens AG and Dresser-Rand. The cycle used an intercooler between compressor stages and a recuperator to recover exhaust heat, increasing thermal efficiency similar to concepts explored by General Electric (GE) and Pratt & Whitney. Power transmission was designed to integrate with gearbox systems from David Brown Gear Systems and electrical propulsion equipment from Siemens Marine and ABB Marine.
The system delivered continuous power outputs tailored for Combined Gas and Gas (COGAG) and Combined Diesel-Electric and Gas (CODLAG/CODOG) arrangements similar to propulsion solutions used on NATO ships and compared with installations on Karel Doorman-class and Horizon-class vessels. The WR-21 used advanced materials and coatings developed with suppliers such as Alstom and Howmet Corporation to withstand marine corrosion and thermal stresses.
The WR-21 was selected for the Type 45 destroyer program, installed on ships constructed by BAE Systems Surface Ships at yards in Scotland and England. Other installations and proposals involved shipbuilders like Thales Group, Fincantieri, Navantia, and Saab Kockums for possible frigate and corvette classes. Export discussions included navies such as the Royal Australian Navy, Canadian Navy, Italian Navy, and the French Navy as part of modernization studies.
Integration work required cooperation with systems integrators including QinetiQ, Rolls-Royce Marine, and electrical systems firms like Siemens Marine and ABB Group. Training and logistics support involved organizations such as Babcock International and naval training establishments like HMS Collingwood and HMS Sultan.
Following installation on early Type 45 hulls, the WR-21 entered operational service with the Royal Navy fleet during deployments to regions including the North Atlantic, the Mediterranean Sea, and the Indian Ocean. Sea trials involved interactions with task groups led by HMS Daring and HMS Dauntless and coordinated with NATO exercises such as Exercise Bersama Shield and Joint Warrior. Logistical support and in-service management engaged entities including the Defence Equipment and Support organization and contractors like Babcock International Group.
The WR-21’s operational life intersected with fleet events including maintenance cycles at Rosyth Dockyard, Portsmouth Dockyard, and Devonport Dockyard, and with geopolitical deployments to support operations in regions such as the Gulf of Aden and the Persian Gulf.
Operational experience revealed challenges with the WR-21’s intercooler-recuperator module in certain environments, particularly hot climates encountered during deployments to Gulf Cooperation Council waters and Middle East operations. Ships reported power generation shortfalls under high ambient temperatures, leading to mission-impacting propulsion limitations noted by Royal Navy engineers and raised in parliamentary inquiries by members of UK Parliament and scrutiny from the Public Accounts Committee.
Maintenance issues required support from manufacturers including Rolls-Royce and subcontractors such as Siemens and prompted retrofit assessments by naval architects at BAE Systems and advisory work by QinetiQ. Comparative assessments referenced alternative turbine solutions from General Electric and diesel-electric systems from MAN Energy Solutions and MTU.
In response to performance shortfalls, upgrade programs involved redesigning cooling and control systems with suppliers including Rolls-Royce engineering teams and partners such as Siemens, ABB, and Babcock International. Retrofit options considered replacement of intercooler-recuperator modules, installation of additional plate heat exchangers from firms like Alfa Laval, and software improvements to control systems developed with Honeywell and Thales Group.
Capability improvements were evaluated alongside alternative propulsion packages from GE Marine and hybrid-electric advisors such as General Dynamics and Lockheed Martin, and modifications were scheduled during maintenance availabilities at yards including Rosyth and Govan Shipyard.
The WR-21 influenced subsequent marine propulsion research, informing designs in intercooling and recuperation studied at institutions like the Imperial College London and the University of Southampton. Lessons from the program affected procurement policy deliberations within the Ministry of Defence (United Kingdom) and comparisons in capability studies with systems from GE, MTU, and Wärtsilä. The technology contributed to a broader industry focus on fuel efficiency and thermal management that shaped later projects at Rolls-Royce Marine and partner firms including Siemens and MAN Energy Solutions.
The operational experience fed into naval engineering curricula at establishments such as Cranfield University and professional bodies like the Royal Institution of Naval Architects and the Institute of Marine Engineering, Science and Technology. The WR-21 remains a case study in complex systems integration for defense procurement officers and industry programs run by primes including BAE Systems, Thales Group, and Rolls-Royce.
Category:Marine gas turbines Category:Rolls-Royce