Modern turbojet engines mainly use computerized digital engine control systems. This opens the way for application of advanced algorithms aimed at increasing their operational efficiency and safety. The theory robust is a set methods known good results in complex tasks, making them ideal candidates current units. Different methodologies design controllers, utilizing small with variable exhaust nozzle designated as iSTC-21v, were therefore investigated article. resulting controllers evaluated...

Turbojet engines have been used for many decades in aviation. Although their share civil aviation is minimal, with the advent of Unmanned Aerial Vehicles (UAV's) there are new applications. Their operation depends on complex aero-thermodynamic laws, and optimum performance strongly affected by control system. The authors previously investigated how Turbofan Power Ratio (TPR), originally introduced Rolls-Royce commercial turbofans, can be single stream turbojet engines. Based those results,...

Gas turbines are widely spread in the aviation industry to propel both commercial and military aircraft. The stable efficient operation of these units is an essential question flight safety; therefore high level control system inevitable. Nowadays all newly designed aircraft engines incorporate Full Authority Digital Electronic Control (FADEC) for fault tolerant behavior reduce workload pilots. goal present article describe development process a modular FADEC small scale experimental...

Centrifugal compressor surge is a very dangerous phenomenon to the working environment of compression system.Unfortunately, most efficient range close boundary stable operation and situation.One main aims this research project find solution which can help operate centrifugal instabilities with much higher level safety.A numerical investigation was made examine flow field behaviour at onset conditions both when discharge bleed air set valve closed.With investigation, calculation calculated in...

Precise dynamic mathematical models of complex systems are important in control and diagnostic design allow testing a system virtual environment at low cost. They can be also utilized rapid prototyping using concept hardware the loop. Ever improving methods experimental identification approaches non-linear approximation considerably increase precision systems. The article deals with transfer gains evaluates influence operational point selection on resulting model data driven identification....

The goal of this article is to develop a linear mathematical model for small scale turbojet engine with variable convergent nozzle, and validate it on existing laboratory hardware owned by the authors’ Departments.Control gas turbine engines plays an essential role in safety aviation. Although its constantly expanding, ranging from pilot workload reduction detailed diagnostics, basic competence regulate thrust output power plant maximum available accuracy, rapidity, stability, robustness....

The goal of this paper is to show the results design a robust, optimal servo control based on LQ for small scale turbojet engine that equipped with variable exhaust nozzle. As mathematical model and identification plant from previous steps research are obtained, now development verification controller solved. major difference between military civil turbine power plants nozzle, which increases flexibility but also in more complex model.

Micro turbojets can be used for propulsion of civilian and military aircraft, consequently their investigation control is essential. Although these power plants exhibit nonlinear behaviour, based on linearized mathematical models in a narrow neighbourhood selected operating point extended by using robust laws like H∞ or Linear Quadratic Integrating (LQI). The primary aim the present paper to develop novel parametric linear model state space representation micro turbojet engines thrust...

The utilization of turbomachines requires up-to-date technologies to ensure safe operation throughout the widest possible range that makes novel ideas necessary cope with classic problems. One most dangerous instability in compression systems is surge has be suppressed before its onset avoid structural damages as well other adverse consequences system. As occurs at low delivered mass flow rates conventional widely spread control based on bypassing unnecessary airflow back atmosphere. This...

Adaptive control is one of the possible methodologies aimed to increase efficiency controlled operation complex systems. Highly theoretical approaches are often presented in design adaptive algorithms. The article at practical aspects controller for a class small turbojet engines. Such engines can be modeled as non-linear systems operating broad range environmental parameters article. designed triple loop architecture shows increased precision keeping acceleration schedule simulated engine...

The main goal of the present paper is to identify coefficients linear state space representation a small scale turbojet engine with variable area convergent exhaust nozzle through measurements on real gas turbine. thermodynamics based mathematical model has been established previously; further steps are conduct laboratory equipment at authors' Department and realize MATLAB simulation in order create basis for quadratic robust controller system. results this research can be implemented both...

Centrifugal compressors play an important role in different industrial fields including transportation and energy management. Their stable operation is critical for the systems which they are installed, thus surge protection essential part of their control. This paper introduces development a simplified one-dimensional mathematical model that able to predict changes compressor characteristic map due novel flow injection method called Blade Load Distribution Control (BLDC). These devices...

Although propulsion systems in commercial aviation rely on high bypass ratio turbofan engines, there is still a niche which turbojet engines can be utilized. Despite some promising experiments that offer the on-wing measurement of most important parameter, thrust engine not available during flight. Turbofan Power Ratio, compound thermodynamic value various pressures and temperatures across engine, proportional to output turbofan, same relationship was proven by author earlier regarding with...

Jet engines are nowadays one of the most popular ways propulsion for aircraft.This type is widely used also in other sectors industry.The main challenging task designers to design reliable and powerful units.There many manners increasing thrust particular jet engine them water injection into compressor.In order such a system, it necessary have information about flow parameters compressor.The proposed article deals with CFD modeling radial compressor estimate further research field thrust.One...

The goal of this paper is to give a short introduction the reader into preliminary results practical investigations active centrifugal compressor surge control using variable inducer shroud bleed (VISB). After establishing mathematical model VISB researches are being carried out on compressor. There detailed description measurement equipment which covers test bench and data acquisition system. With evaluation thermodynamic operational parameters system, theoretical investigation can be...

Centrifugal compressors are used in many areas of industry, for example from natural gas transportation to superchargers internal combustion engines and compressor stages aircraft the air compression equipment rapidly expanding fuel cell powered systems. With regards each field usage compressors, reliable operation is an important criteria compressor, addition ensuring a continuous adequate medium supply. This process easier implement if terrestrial applications, where these can be operated...

Centrifugal compressors are used in a multitude of industrial applications, and their reliable operation is critical all fields. In order to enhance stability, different methods available suppress surge, one possible solution recirculating air from compressor discharge into the blade passage control load distribution. This paper has aim investigate effect surge suppression holes on stress distribution centrifugal impeller hub. The authors have conducted conjunct fluid dynamics structural...

At the Department of Aeronautics, Naval Architecture and Railway Vehicles Budapest University Technology Economics there is a versatile micro turbojet test bench based on TS-21 turbostarter engine. Besides research developement purposes it offers more practical study experience for aerospace engineering students. In this authors have accomplished theoretical design an additional fan stage to original Based results decision can be made, whether modification present device worth or not. For...

The requirements in widening the range of centrifugal compressor operation, combined with competent efficiency cannot be achieved using conventional methods. need for low energy consumption, rapidly reacting actuation systems is inevitable also field surge control. goal this paper to develop model Variable Inducer Shroud Bleed, focusing on dynamic behavior system, which can an alternative other active suppression. In order accomplish requirement, has been realized MATLAB Simulink...

A centrifugális kompresszorok csak üzemidejük töredékében működhetnek optimális körülmények között, emiatt mindenképpen indokolt azok instabil üzemállapotainak vizsgálata. határréteg elszívása vagy elvezetése, valamint a turbulens lefúvásamár több évtizede alkalmazott, kipróbált technológiának számít repülésben és más, áramlástechnikai gépeket alkalmazó iparágban. turbulenssé tétele az abban megvalósított impulzuscsere által azonban összetettebb folyamat, amely új áramlástani szimulációs...

Main goal of this paper is to develop a linear state space representation micro turbojet engine based on physical laws describing the operation power plant. The importance turbine engines constantly rising; therefore it essential improve their reliability through advanced control systems. They can produce shaft and heat in industrial applications they be used as propulsion for small scale manned or unmanned aerial vehicles well. In either form usage safety primary factor hence development...