Oxford Thermofluids Institute | Research - Research Groups: Oxford Turbine Research Facility Group

The Oxford Turbine Research Facility (OTRF) is a large-scale rotating turbine research facility within the Oxford Thermofluids Institute (OTI), enabling experimental investigation of high-pressure turbine aerodynamics, heat transfer and cooling at full engine scale and under engine-representative conditions.

Our research addresses the complex aerothermal processes that determine the efficiency, cooling requirements and durability of modern aero-engine turbines. We combine advanced experimental measurement techniques with engine-representative turbine hardware and work closely with industrial and academic partners to address both fundamental research questions and challenges relevant to current and future propulsion technologies.

The OTRF research programme is led by Professor Paul Beard, Associate Professor and Principal Investigator of OTRF.

Research

Our research focuses on experimental turbine aerothermodynamics, with particular interests in high-pressure turbine aerodynamic performance, cooling and heat transfer, secondary-air systems, component durability, combustor–turbine interaction and advanced experimental measurement.

Turbine cooling and heat transfer

Increasing turbine operating temperature is fundamental to improving aero-engine efficiency but places increasingly demanding requirements on turbine cooling systems. We investigate the interaction between turbine aerodynamics, coolant flows and component thermal response under engine-representative rotating conditions.

Research includes fully cooled turbine configurations, novel cooling technologies and the influence of cooling flows and component condition on turbine aerodynamic and thermal performance. A particular objective is to understand cooling at system level: how individual cooling streams interact with the mainstream flow and ultimately determine component thermal protection.

Advanced thermal measurement

We develop advanced optical and thermal measurement methods for the challenging environment of a high-speed rotating turbine.

Recent research has established high-speed infrared thermography for quantitative full-field thermal measurements on transonic rotating turbine blades. New approaches to radiometric calibration, high-speed image acquisition and image processing allow measurements to be made on blades travelling at approximately 300 m/s.

This capability enables spatially resolved measurements of turbine thermal boundary conditions and heat transfer under engine-representative rotating conditions, providing new experimental data for understanding cooling performance and validating computational methods.

Engine-representative turbine aerothermodynamics

OTRF provides a platform for investigating high-pressure turbine aerodynamics and heat transfer under highly representative conditions.

Current and recent research has investigated rotor-tip aerodynamics and heat transfer, tip geometry and clearance, turbine inlet-temperature distortion, thermal unsteadiness and the interaction between aerodynamic and thermal performance.

Experiments are designed to provide detailed measurements of the physical mechanisms governing turbine behaviour and datasets for validation of computational methods used in turbine design.

Component durability and deterioration

Changes in turbine component condition during service can affect cooling, heat transfer, aerodynamic performance and component life.

Our research investigates the aerothermal consequences of component deterioration and potential mitigation technologies under representative turbine conditions. This includes experimental assessment of cooling modifications and deteriorated turbine geometries, connecting fundamental aerothermal understanding with practical engineering challenges affecting in-service engines.

Secondary-air systems

Secondary-air systems provide cooling and sealing flows to the turbine but interact strongly with the mainstream gas path.

Our research investigates rim-seal ingestion, turbine disc-cavity flows and the unsteady flow structures governing secondary-air-system performance. Experimental work is combined with complementary computational research to understand the fundamental mechanisms controlling ingestion and sealing effectiveness.

Combustor–turbine interaction

The flow entering a high-pressure turbine contains spatial and temporal variations in temperature, pressure, swirl and turbulence generated by the upstream combustor. These can have a significant influence on downstream turbine aerodynamics, cooling and heat transfer.

OTRF has established capability for reproducing representative turbine inlet distortions and is developing advanced combustor simulation methods to provide increasingly realistic temperature, turbulence and aerodynamic profiles at the turbine inlet.

The Oxford Turbine Research Facility

OTRF is a full-scale, short-duration, rotating high-pressure turbine facility. Its operating principle allows the key non-dimensional aerodynamic and thermal parameters of an aero-engine turbine to be reproduced while retaining extensive access for instrumentation.

The facility comprises a 1½-stage axial turbine. A piston-tunnel system generates an approximately 0.5-second test period at engine-representative Reynolds and Mach numbers, while the rotor operates at speeds of approximately 9500 rpm. Vanes and rotor blades can be cooled, allowing detailed investigation of highly cooled turbine configurations.

Experimental techniques include aerodynamic pressure and performance measurements, thin-film heat-transfer instrumentation, high-speed infrared thermography and detailed surveys of turbine flow conditions.

The facility has undergone successive development in turbine geometry, cooling capability, combustor simulation, instrumentation and thermal measurement, enabling increasingly complex research questions to be investigated under representative rotating conditions.

OTRF is supported by the wider experimental and technical infrastructure of the Oxford Thermofluids Institute, including high-pressure and high-temperature air systems, specialist instrumentation and engineering capability.

Industrial collaboration

OTRF has a longstanding strategic research relationship with Rolls-Royce, with programmes spanning turbine aerodynamic performance, cooling, component durability, advanced measurement and experimental capability. Research from OTRF has contributed to the development of Rolls-Royce turbine technology and engine-design methods.