Loading...
Search for:
similar-models
0.006 seconds
Using approximate similitude to design dynamic similar models
, Article Aerospace Science and Technology ; Volume 94 , 2019 ; 12709638 (ISSN) ; Hajipouzadeh, P ; Sharif University of Technology
Elsevier Masson SAS
2019
Abstract
This research deals with the analysis of approximate similitude between the dynamic similar models and the full-scale prototype of an aircraft. Due to physical and technical constraints, a full dynamic similarity is not practically possible and previous works have all neglected one or two similarity criteria like Mach or Reynolds numbers for the sake of Froude number similarity. In this work, it is shown that Mach number has an important effect on aerodynamic characteristics and dynamic response of an aircraft and that neglecting it makes the generalization of the scale-model test data invalid for the full-scale prototype. In order to address this problem, a measurable quantity named...
Toward the feasible solution of a long-lasting dynamic similitude problem
, Article Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering ; 2022 ; 09544100 (ISSN) ; Banazadeh, A ; Sharif University of Technology
SAGE Publications Ltd
2022
Abstract
Dynamic similar models are designed to study the flight behavior of the full-scale aircraft in early design stages. Due to physical and operational constraints, full dynamic similarity between the scaled-down model and full-scale aircraft is not feasible. Thus, the scale model would be flying at different Reynolds number and Mach number. A given aircraft configuration with specific aerodynamic characteristics will have different performance if Mach number and Reynolds number are changed considerably, which results in different dynamic behavior of the scale model. To compensate for these dissimilarities, it is proposed to modify the airfoil geometry of the scale model to preserve aerodynamic...
Quantification of Partial Similitude and Multi-Fidelity Design Optimization of Dynamic Similar Models
, Ph.D. Dissertation Sharif University of Technology ; Banazadeh, Afshin (Supervisor)
Abstract
In this thesis, a framework for measuring the relative dynamic similarity and multi-fidelity design of the dynamic similar model of aircraft is presented. The conditions for establishing dynamic similarity between the scaled model and the original aircraft have been investigated for different applications and the methods for establishing relative dynamic similarity have been studied. In related researches conducted in the field of designing similar dynamic models of flying devices, the degree of relative similarity has not been measured and usually one or more scaling laws have been omitted according to the type of application. In this thesis, it has been shown that partial dynamic...
Natural gas viscosity estimation using density based models
, Article Canadian Journal of Chemical Engineering ; Volume 91, Issue 6 , JUL , 2013 , Pages 1183-1189 ; 00084034 (ISSN) ; Jarrahian, A ; Sharif University of Technology
2013
Abstract
Accurate value determination of natural gas viscosity plays a key role in its management as it is one of the most important parameters in natural gas engineering calculations. In this study, a comprehensive model is suggested for prediction of natural gas viscosity in a wide range of pressures, temperatures, densities and compositions. The new model can be applicable for gases containing heptane plus and non-hydrocarbon components. It is validated by the 2011 viscosity data from 18 different gas mixtures. Compared to existing similar models and correlations, its results are quite satisfactory