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Boerstoel, J.W. (author)In dit literatuviroverzicht wordt een bespreking gegeven van de gelineariseerde transsone theorieën voor vlakke symmetrische en aaiaal symmetrische stromingen, zoals die door Oswatitsch en Keune, Maeder en Thommen, en Spreiter en Alksne zijn ontwikkeld. Een vereenvoudigde versie van de theorie van de z.g. gelineariseerde transsone...report 1963
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Boerstoel, J.W. (author)An introductory description of a hodograph method for the Computation of advanced shock-free aerofoils is presented. The method is based on the approximate solution of Tricomi boundary value problems for the hodograph equations. The approximate solution is a sum of a basic solution having the required singularity on the hodograph surface...report 1964
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Boerstoel, J.W. (author)The hodograph method and its application as described in reference 1 allow the construction of steady transonic potential flows around aerofoil sections. This report gives results of the application of this method as far as non-lifting symmetrical sections are concerned. The results show that with a restricted use of the possibihties of the...report 1967
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Boerstoel, J.W. (author)An iterative method for the computation of non-circulatory flows of the Karmann-Tsien gas over aerofoil sections is presented. Within 3 or 4 steps the method converges to results with sufficient precision to be acceptable from an engineering point of view. The computational method has been used to get some insight into the value of the Karman...report 1968
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Boerstoel, J.W. (author)The results of the computation of fifteen symmetrical non-lifting quasi-elliptical aerofoil sections in steady sub-critical and critical potential flows are presented. These results are exact in the sense, that no approximations have been made in the potential theory, and that the errors in the results are of numerical nature only. The results...report 1968
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Baurdoux, H.I. (author), Boerstoel, J.W. (author)The results of the computation of 10 symmetrical non-lifting quasi-elliptical aerofoil sections in transonic potential flows are presented. No approximations have been made in the potential theory. Results are summarized in figures and tables. The figures permit a rapid appraisal of the overall properties. More detailed information is given in...report 1968
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- Boerstoel, J.W. (author), Huizing, G.H. (author) report 1971
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- Boerstoel, J.W. (author), Huizing, G.H. (author) report 1971
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Boerstoel, J.W. (author), Huizing, G.H. (author)An approxinate m ethod is presented for the mapping of simply - connected closed regions bounded by a smooth ourve onto a circular disk using harmonic polymials. Due attention is being paid to the handling of the singularities that usually disturb the regularity of the mapping near the boundary of the region. Some numerical examples illustrate...report 1971
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Boerstoel, J.W. (author), Uijlenhoet, R. (author)Nieuwland's hodograph theory for Ufting quasi-elliptical aerofoils has been applied to compute a number of profiles with supercritical shockfree flow at the design condition. These profiles appear to have nose camber only. The pressure distribution at the design condition is of the peaky type. The minimum radius of curvature at the nose is of...report 1971
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Boerstoel, J.W. (author), Huizing, G.H. (author)It is known that design of arbitrary shock-free transonic aerofoils is possible by solving general boundary value problems for the mixed elliptichyperbolic hodograph equations. Based on this approach a design method for shock-free transonic aerofoils has been developed. Some problems of the mathematical theory underlying the method are discussed...report 1973
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- Boerstoel, J.W. (author) report 1973
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Boerstoel, J.W. (author), Huizing, G.H. (author)A design method for transonic shock-free aerofoils using analytic hodograph theory is sketched. A user-oriented outline of the program system that has been developed is presented. A number of examples of computed aerofoils show that the performance of the program system seems to be sifficient for advanced transonic shock-free aerofoil design.report 1973
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- Boerstoel, J.W. (author), Huzing, G.H. (author) report 1974
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Boerstoel, J.W. (author), Huizing, G.H. (author), van Woerkom, P.T.L.M. (author)Purpose of the present study is the investigation of the validity of a new algorithm for the estimation of parameters related to spacecraft torques. The algorithm is based on data reduction by numerical differentiation using smoothing splines. Measured data of the ESRO lA "Aurorae" spacecraft are used. It is concluded that the new data reduction...report 1974
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van Egmond, J.A. (author), Boerstoel, J.W. (author)This report contains data of eighteen aerofoils, calculated with the NLR transonic hodograph theory. They give an impression about the possibilities of the calculation method for application in aerofoil design studies. The data are presented in graphical form. For two aerofoils also tabulated results are given.report 1975
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- Boerstoel, J.W. (author) report 1975
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- Boerstoel, J.W. (author) report 1976
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Boerstoel, J.W. (author)In this study, an algorithm for the computational design of supercritical shock-free aerofoils is developed and analyzed with hodograph theory. Such an algorithm may be based on the combination of two approaches for the construction of solutions of the flow equations for shock-free transonic flow. In the first approach, such solutions are...report 1977
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Boerstoel, J.W. (author)Dit memo heeft tot doel bij te dragen in de discussies over het ontwikkelen van nieuwe rekenprogramma's voor drie-dimensionale stationaire transsone stromingen om romp-vleugel combinaties. Gepresenteerd wordt: a. een inventarisatie van thans bekende snelle oplossers voor randwaarde problemen van partiële differentiaal vergelijkingen; b. een...report 1977