1993 Cilt 4 Sayı 1

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An application of the aircraft identification
(Uludag Universitesi, 1993) Ture, Murat; Uludag Universitesi; Muhendislik Mimarlık Fakultesi; Elektronik Mühendisligi Bolumu
In this study, a solution of an aircraft identification problem is presented. Firstly, the essential equations of longitudinal motion are introduced and simplified. Subsequently, this motion is simulated with a suitable model as a real aircraft. Finally, the model system has been identified in real time for different environmental condition.
Turbulent flows in annular ducts
(Uludağ Üniversitesi, 1993) Umur, Habib; Mühendislik Mimarlık Fakültesi; Makine Bölümü
Skin friction factors, mean and secondary flow velocities together with normal and Reynolds stresses were measured in an eccentric annular duct (eccentricity of unity) with a Newtonian fluid at Reynolds numbers of 9000 and 26600 which ensured turbulent and fully developed turbulent flows. The three components of mean and rms velocities were recorded by the use of laser Doppler velocimeter with a refractive index marching technique. Static pressure distribution was smaller (up to 15%) than asmooth pipe and near wall velocities deviated from the law of the wall up te 5 %. The location of maximum velocity and zero shear stress occurred at the same locations within the measurement accuracy. The secondary flow velocities of less than 2% of the bulk velocity showed two eel/s of circulation at each side of the symmetry.