Guide vane arrangement for use in a turbine

A method of operating a turbine configured for use in a turbo pump, wherein the turbine includes a guide vane arrangement arranged upstream of a turbine rotor, the method comprising:

• supplying a fluid flow from upstream of the turbine rotor to a flow channel defined between a leading surface of a first guide vane and a trailing surface of a second guide vane of the guide vane arrangement;
• and
• guiding the fluid flow along a trailing portion of the trailing surface of the second guide vane which is arranged adjacent to a trailing edge of the second guide vane and thereby deflecting the fluid flow such that the fluid flow exits the flow channel at a first flow angle with respect to a virtual plane defined by a trailing edge of the first guide vane and the trailing edge of the second guide vane,
• wherein the fluid flow, prior to being guided along the trailing portion of the trailing surface, is guided, along a leading portion of the trailing surface of the second guide vane which is arranged adjacent to a leading edge of the second guide vane and thereby deflected such that the fluid flow flows at a second flow angle with respect to the virtual plane defined by the trailing edge of the first guide vane and the trailing edge of the second guide vane, the second flow angle being larger than the first flow angle, and thereafter is guided along an intermediate portion of the trailing surface of the second guide vane which is arranged between the trailing portion and the leading portion and thereby deflected such that the fluid flow flows at a third flow angle with respect to the virtual plane defined by the trailing edge of the first guide vane and the trailing edge of the second guide vane, the third flow angle being smaller than the first flow angle.